Introduction

The deep seabed beyond national jurisdiction is one of the most distinctive areas of the modern international law of the sea.

UNCLOS refers to this area as “the Area.” It consists of:

the seabed and ocean floor and subsoil thereof, beyond the limits of national jurisdiction.

The Area is governed primarily by Part XI of UNCLOS, Articles 133–191, together with Annex III and Annex IV and the 1994 Agreement relating to the Implementation of Part XI of UNCLOS.

The central principle is:

The Area and its mineral resources are the common heritage of mankind.

No State may claim sovereignty or sovereign rights over the Area or its resources.

Meaning of the Area

Article 1(1)(1) UNCLOS

The Area means:

The seabed and ocean floor and subsoil thereof, beyond the limits of national jurisdiction.

Therefore, the Area is not simply:

• deep water;
• the high seas;
• every part of the ocean beyond 200 nautical miles.

It specifically concerns the:

Seabed + Ocean Floor + Subsoil

that lies beyond national jurisdiction.

Deep Seabed vs High Seas

These concepts must be distinguished.

High Seas

Concern primarily the:

Water column

beyond national maritime zones.

The Area

Concerns:

Seabed + Ocean Floor + Subsoil

beyond national jurisdiction.

Therefore:

High Seas ≠ The Area

A useful way to remember it is:

Water Column → High Seas

Seabed/Subsoil → The Area

Location of the Area

The Area begins beyond the limits of national jurisdiction.

This generally means areas of seabed that are not part of a State’s continental shelf.

A coastal State may have continental-shelf rights extending beyond 200 nautical miles under Article 76.

Therefore:

Beyond 200 nm ≠ Automatically the Area

An extended continental shelf may exist beyond 200 nautical miles.

Only the seabed and subsoil beyond the limits of national jurisdiction form the Area.

Legal Basis

The principal provisions are found in:

Part XI of UNCLOS

Important provisions include:

• Article 133 → Definitions
• Article 136 → Common heritage of mankind
• Article 137 → Legal status of the Area and its resources
• Article 138 → General conduct of States
• Article 139 → Responsibility for compliance
• Article 140 → Benefit of mankind
• Article 141 → Use exclusively for peaceful purposes
• Article 142 → Rights and legitimate interests of coastal States
• Article 143 → Marine scientific research
• Article 144 → Transfer of technology
• Article 145 → Protection of marine environment
• Article 146 → Protection of human life
• Article 147 → Accommodation of activities in the Area and other marine activities
• Article 148 → Participation of developing States
• Article 149 → Archaeological and historical objects
• Articles 150–151 → Policies and production policies
• Articles 153–155 → Exploration and exploitation system
• Articles 156–185 → International Seabed Authority
• Annex III → Basic conditions of prospecting, exploration and exploitation
• Annex IV → Enterprise

Common Heritage of Mankind

Article 136 UNCLOS

The Area and its resources are declared to be:

The Common Heritage of Mankind

This is the foundational principle governing the deep seabed.

It means that the resources of the Area cannot simply become the property of whichever State or corporation reaches them first.

Meaning of Common Heritage of Mankind

The principle has several important consequences.

No National Appropriation

No State may claim sovereignty over any part of the Area.

No Private Ownership Through Mere Discovery

A company cannot acquire ownership of Area resources merely by discovering them.

Resources Are Held for the Benefit of Mankind

The exploitation regime must operate within the international system established by UNCLOS.

Special Consideration for Developing States

The system is intended to ensure that benefits are shared in accordance with the UNCLOS framework.

Article 137 – Legal Status

Article 137 provides that:

No State may claim or exercise sovereignty or sovereign rights over any part of the Area or its resources.

No State or natural or juridical person may appropriate any part of the Area.

Therefore:

The Area → No National Sovereignty

and:

Area Resources → Cannot Be Appropriated Unilaterally

Resources of the Area

Article 133 defines resources of the Area as:

All solid, liquid or gaseous mineral resources in situ in the Area

including:

• polymetallic nodules;
• polymetallic sulphides;
• cobalt-rich ferromanganese crusts.

Once recovered from the Area, they are referred to as minerals.

Deep-Sea Minerals

Important minerals associated with deep seabed mining include:

Polymetallic Nodules

Often containing:

• manganese;
• nickel;
• cobalt;
• copper.

Polymetallic Sulphides

Associated with hydrothermal vents and may contain:

• copper;
• zinc;
• gold;
• silver.

Cobalt-Rich Ferromanganese Crusts

Can contain:

• cobalt;
• nickel;
• manganese;
• other minerals.

Exploitation of the Area

The Area is not left completely untouched by international law.

UNCLOS establishes an international system for:

Prospecting

↓

Exploration

↓

Exploitation

of mineral resources.

International Seabed Authority

The central institution is the:

International Seabed Authority (ISA)

The ISA was established under Part XI of UNCLOS to organise and control activities in the Area.

Its headquarters are in:

Kingston, Jamaica.

Purpose of the ISA

The ISA acts on behalf of mankind as a whole in relation to the Area’s resources.

Its functions include:

• organising activities in the Area;
• regulating exploration and exploitation;
• approving plans of work;
• establishing rules and regulations;
• protecting the marine environment;
• ensuring compliance;
• promoting equitable benefit arrangements.

Article 157 – ISA

The ISA is the organisation through which States Parties organise and control activities in the Area.

Its authority extends specifically to:

Activities in the Area

It is not a general international government of the oceans.

Principal Organs of the ISA

The main organs include:

Assembly

The Assembly consists of all members of the ISA.

It is the principal policy-making organ.

Council

The Council is the executive organ.

It is responsible for important regulatory and supervisory functions.

Secretariat

The Secretariat performs administrative functions.

Legal and Technical Commission

It provides scientific and technical expertise, particularly concerning:

• plans of work;
• exploration;
• environmental matters;
• regulatory standards.

Finance Committee

It deals with financial matters within the ISA framework.

The Enterprise

The Enterprise is an organ created under Annex IV.

Its purpose is to undertake activities in the Area in accordance with UNCLOS.

The original Part XI system envisaged the Enterprise as a major operational component of deep seabed development.

The 1994 Implementation Agreement substantially modified the institutional and financial arrangements concerning the Enterprise.

1994 Implementation Agreement

The original Part XI regime generated significant disagreement, particularly from developed States.

Concerns included:

• financial obligations;
• production controls;
• mandatory technology transfer;
• decision-making;
• the structure of the Enterprise;
• economic implications for existing mineral producers.

The 1994 Agreement relating to the Implementation of Part XI of UNCLOS modified the operation of Part XI.

Importance of the 1994 Agreement

The Agreement:

• modifies the implementation of Part XI;
• provides more market-oriented arrangements;
• changes aspects of the Enterprise system;
• modifies financial arrangements;
• adjusts decision-making;
• addresses technology-transfer provisions.

It is therefore essential to understand:

UNCLOS Part XI + 1994 Implementation Agreement

as the modern legal framework for activities in the Area.

Activities in the Area

Article 153

Activities in the Area are organised, carried out and controlled by the ISA.

Such activities include:

• exploration;
• exploitation;
• recovery of minerals.

The system operates through approved:

Plans of Work

Sponsoring States

Private companies and State enterprises do not simply receive an international right to mine the seabed independently.

They operate within the UNCLOS/ISA system and may require sponsorship by a State Party.

The sponsoring State has important responsibilities concerning compliance.

Article 139 – State Responsibility

States Parties are responsible for ensuring that activities in the Area conducted by:

• State entities;
• nationals;
• natural or juridical persons under their jurisdiction or control;

are carried out consistently with UNCLOS.

A sponsoring State therefore has an important supervisory role.

Advisory Opinion on Sponsoring States

Responsibilities and Obligations of States Sponsoring Persons and Entities with Respect to Activities in the Area

The Seabed Disputes Chamber of ITLOS issued an important advisory opinion in 2011.

It clarified that sponsoring States have significant obligations concerning:

• due diligence;
• environmental protection;
• compliance with ISA rules;
• supervision of sponsored entities.

Due Diligence

The sponsoring State is not automatically liable for every harmful act committed by a sponsored contractor.

However, it must exercise an appropriate level of:

Due diligence

to ensure compliance.

The required level may depend upon:

• scientific knowledge;
• environmental risks;
• applicable regulations;
• circumstances of the activity.

Environmental Protection

Deep seabed mining creates serious environmental concerns.

UNCLOS therefore gives marine environmental protection a central position.

Article 145

The ISA must adopt appropriate rules and procedures to ensure effective protection of the marine environment from harmful effects arising from activities in the Area.

Environmental Risks

Deep seabed activities may potentially cause:

• disturbance of seabed ecosystems;
• sediment plumes;
• habitat destruction;
• loss of biodiversity;
• disruption of deep-sea ecological processes.

Because scientific knowledge of deep-sea ecosystems remains developing, the legal regime increasingly emphasises precaution and environmental assessment.

Marine Scientific Research

Article 143

Marine scientific research in the Area is to be carried out:

• for the benefit of mankind as a whole;
• for peaceful purposes.

States and competent international organisations are encouraged to promote:

• international cooperation;
• dissemination of knowledge;
• scientific research;
• exchange of information.

Technology Transfer

Article 144

States and competent international organisations are expected to cooperate in:

Transfer of technology

relating to activities in the Area.

The purpose is to enable developing States to participate more effectively in activities concerning the Area.

The 1994 Implementation Agreement modified the original mandatory technology-transfer approach.

Benefit of Mankind

Article 140

Activities in the Area must be carried out for the benefit of mankind as a whole.

This includes:

• developing States;
• developed States;
• present and future generations.

The Area is therefore not treated as a resource reserve belonging to a particular group of States.

Equitable Sharing

Article 140 contemplates the equitable sharing of financial and other economic benefits derived from activities in the Area.

The detailed system is developed through the ISA framework.

Developing States

The UNCLOS regime gives particular importance to the participation and interests of developing States.

Article 148

Developing States are to be given special consideration with respect to activities in the Area.

This is connected to:

• technology;
• training;
• participation;
• economic opportunities.

Landlocked and Geographically Disadvantaged States

The common-heritage regime is intended to benefit mankind as a whole, including States that may not have the technological or financial capacity to independently exploit deep seabed resources.

This is particularly significant for:

• developing States;
• landlocked States;
• geographically disadvantaged States.

Peaceful Purposes

Article 141

The Area is open for use exclusively for:

Peaceful purposes

This reflects the broader principle of peaceful use of the oceans.

Coastal-State Rights

Activities in the Area must respect the rights and legitimate interests of coastal States.

Article 142

Where activities in the Area may affect:

• resource deposits;
• coastal areas;
• maritime activities;

the rights and legitimate interests of coastal States must be taken into account.

Marine Environment

The Area is governed by broader environmental obligations under UNCLOS.

Relevant concerns include:

• prevention of pollution;
• preservation of ecosystems;
• protection of biodiversity;
• scientific monitoring;
• environmental impact assessment.

Archaeological and Historical Objects

Article 149

Archaeological and historical objects found in the Area must be preserved or disposed of for the benefit of mankind as a whole.

Particular regard must be paid to:

• preferential rights of the State or country of origin;
• cultural;
• historical;
• archaeological connections.

Common Heritage vs Res Communis

These concepts should not be confused.

Res Communis

Traditionally means something not capable of being appropriated as national territory and open to common use under international law.

Common Heritage of Mankind

The Area’s resources are governed by a specific international legal regime involving:

• non-appropriation;
• international administration;
• benefit sharing;
• peaceful use;
• environmental protection.

Therefore:

The Area is not simply “open to everyone.”

It is subject to institutional international regulation.

The Area vs High Seas

The Area	High Seas
Seabed + ocean floor + subsoil	Water column
Beyond national jurisdiction	Beyond national maritime zones
Part XI UNCLOS	Part VII UNCLOS
Common heritage of mankind	High-seas freedoms
ISA regulates mineral activities	Generally flag-State jurisdiction
No national appropriation	No sovereignty
Deep seabed resources	Navigation, fishing and other freedoms

The Area vs Continental Shelf

The Area	Continental Shelf
Beyond national jurisdiction	Under coastal-State jurisdiction
Part XI	Part VI
Common heritage	Coastal-State sovereign rights
ISA system	Coastal State controls exploration/exploitation
No national appropriation	Rights are exclusive to coastal State
Seabed/subsoil	Seabed/subsoil

The Area vs EEZ

The Area	EEZ
Beyond national jurisdiction	Up to 200 nm generally
Part XI	Part V
Common heritage	Coastal-State sovereign rights
ISA	Coastal State
Deep seabed minerals	Water-column + seabed resource rights
No sovereignty	Coastal State has specified sovereign rights/jurisdiction

Deep Seabed Mining

Deep seabed mining involves extracting minerals from the seabed at great depths.

The legal framework requires activities to take place under the:

UNCLOS + ISA System

rather than through unilateral national appropriation.

Exploration vs Exploitation

These should be distinguished.

Exploration

Activities designed to:

• identify resources;
• assess deposits;
• study geological characteristics;
• evaluate commercial potential.

Exploitation

Actual recovery and commercial extraction of mineral resources.

Prospecting

Prospecting involves searching for mineral resources without necessarily having exclusive rights to exploit them.

Therefore:

Prospecting → Exploration → Exploitation

represent different stages.

Contractors

The ISA may enter into contracts with qualified contractors for exploration and, within the applicable regulatory framework, exploitation.

Contractors may include:

• States;
• State enterprises;
• nationals of States Parties;
• juridical persons sponsored by States Parties.

Plans of Work

Activities require approval through a:

Plan of Work

The ISA assesses matters such as:

• technical capacity;
• financial capacity;
• environmental impact;
• compliance with applicable regulations.

Environmental Impact Assessment

Environmental assessment is increasingly important in deep seabed activities.

The legal framework requires attention to:

• environmental baseline studies;
• monitoring;
• risk assessment;
• mitigation;
• emergency response.

Precautionary Approach

Given uncertainty concerning deep-sea ecosystems, international seabed governance increasingly incorporates precautionary environmental principles.

This is especially relevant where:

• scientific knowledge is incomplete;
• irreversible damage is possible;
• biodiversity may be affected.

“Common Heritage” Does Not Mean “Free Mining”

This is a very important examination point.

The principle means:

Internationally Regulated Use

not:

Unrestricted Public Access

Mineral resources cannot simply be extracted without compliance with the international regime.

Responsibility for Environmental Harm

The legal framework distinguishes between:

• responsibility of States;
• responsibility of international organisations;
• contractor obligations.

The 2011 Sponsoring States Advisory Opinion is particularly important for understanding the responsibilities of sponsoring States.

International Seabed Authority and International Tribunal for the Law of the Sea

The two institutions are different.

ISA

Regulates and administers activities in the Area.

ITLOS

Adjudicates certain disputes concerning the interpretation and application of UNCLOS.

The Seabed Disputes Chamber of ITLOS has particular jurisdiction concerning activities in the Area.

Seabed Disputes Chamber

The Chamber deals with disputes relating to:

• activities in the Area;
• responsibilities of States;
• contractors;
• ISA decisions and legal questions.

Its jurisdiction is specifically connected with Part XI.

Important Case: Advisory Opinion on Sponsoring States

Responsibilities and Obligations of States Sponsoring Persons and Entities with Respect to Activities in the Area (2011)

The Seabed Disputes Chamber held that sponsoring States have obligations of due diligence.

The case is important for:

• State responsibility;
• environmental protection;
• sponsorship;
• deep seabed mining;
• precaution;
• compliance with ISA rules.

Examination Point

2011 Advisory Opinion → Sponsoring State + Due Diligence + Environmental Protection

Important Case: Seabed Disputes Chamber – Activities in the Area

The Chamber’s jurisprudence has contributed to understanding:

• State responsibility;
• contractor responsibility;
• sponsorship;
• environmental obligations;
• ISA regulatory authority.

Importance of Part XI

Part XI represents a major development in international law because it moves beyond the traditional idea of freedom of the seas.

Instead, it establishes:

International Management of Resources Beyond National Jurisdiction

This makes the Area one of the strongest examples of institutionalised international resource governance.

1994 Agreement and Modern Regime

For examination purposes, it is important to remember that the original Part XI provisions should not be studied in isolation.

The modern framework consists of:

UNCLOS Part XI

1994 Implementation Agreement

The 1994 Agreement modified several controversial aspects of the original regime.

Common Examination Mistakes

Mistake 1: The Area Means the High Seas

Incorrect.

The Area concerns the seabed, ocean floor and subsoil beyond national jurisdiction.

Mistake 2: Everything Beyond 200 Nautical Miles Is the Area

Incorrect.

A coastal State may have an extended continental shelf beyond 200 nautical miles under Article 76.

Mistake 3: The Area Belongs to the United Nations

Incorrect.

The Area is not the territorial property of the UN.

It is governed under the international regime established by UNCLOS and administered through the ISA.

Mistake 4: Any State Can Mine the Area Freely

Incorrect.

Activities must comply with the UNCLOS/ISA framework.

Mistake 5: The Resources Belong to the First Discoverer

Incorrect.

Article 137 prohibits appropriation.

Mistake 6: Common Heritage Means No Regulation

Incorrect.

The Area is subject to extensive international regulation.

Mistake 7: ISA Owns the Area as Sovereign

Incorrect.

The ISA does not possess territorial sovereignty over the Area.

It organises and controls activities in accordance with UNCLOS.

Mistake 8: High-Seas Freedom of Fishing Applies to Deep Seabed Minerals

Incorrect.

Fishing and mineral resources are governed by different legal regimes.

Mistake 9: Coastal States Have No Interest in Activities in the Area

Incorrect.

Article 142 requires respect for coastal States’ rights and legitimate interests.

Mistake 10: Sponsoring State Is Automatically Liable for Every Contractor Act

Incorrect.

The 2011 Advisory Opinion emphasises due diligence, not automatic liability for every act.

Quick Revision

• The Area → seabed, ocean floor and subsoil beyond national jurisdiction.
• Main framework → Part XI UNCLOS.
• Article 133 → resources and definitions.
• Article 136 → common heritage of mankind.
• Article 137 → no sovereignty or appropriation.
• Article 139 → responsibility for compliance.
• Article 140 → benefit of mankind.
• Article 141 → peaceful purposes.
• Article 142 → coastal-State rights and interests.
• Article 143 → marine scientific research.
• Article 144 → technology transfer.
• Article 145 → marine environmental protection.
• Article 146 → human life.
• Article 148 → developing States.
• Article 149 → archaeological/historical objects.
• Articles 153–155 → activities and plans of work.
• Articles 156 onwards → International Seabed Authority.
• ISA → organ responsible for organising and controlling activities in the Area.
• Area resources → mineral resources in situ.
• Important minerals:
  • polymetallic nodules;
  • polymetallic sulphides;
  • cobalt-rich ferromanganese crusts.
• Area ≠ high seas.
• Area ≠ continental shelf.
• Area ≠ EEZ.
• Beyond 200 nm ≠ automatically Area.
• Coastal State may have an extended continental shelf beyond 200 nm.
• Area → common heritage of mankind.
• No State may claim sovereignty over the Area.
• No State or person may appropriate Area resources.
• Activities include:
  • prospecting;
  • exploration;
  • exploitation.
• Activities operate through the UNCLOS + ISA system.
• Contractors require the applicable international authorisation/sponsorship framework.
• Sponsoring States have due-diligence obligations.
• 2011 Seabed Disputes Chamber Advisory Opinion → sponsoring States.
• Article 145 → environmental protection.
• Article 140 → benefit of mankind.
• Article 144 → technology transfer.
• Article 148 → developing States.
• Article 149 → archaeological/historical objects.
• 1994 Implementation Agreement modified the original Part XI regime.
• Seabed Disputes Chamber → disputes concerning activities in the Area.
• Core principle:

The Area = Common Heritage of Mankind + No National Appropriation + International Regulation

One-Line Memory Trick

“136 – 137 – 140 – 145 – 153 – ISA”

136 → Common Heritage

137 → No Sovereignty / No Appropriation

140 → Benefit of Mankind

145 → Environment

153 → Activities

ISA → International Seabed Authority

And:

“Seabed Beyond National Jurisdiction = The Area”

Final Deep-Seabed Formula

Seabed + Ocean Floor + Subsoil

↓

Beyond National Jurisdiction

↓

THE AREA

↓

Article 136

→ Common Heritage of Mankind

↓

Article 137

→ No Sovereignty / No Appropriation

↓

ISA

→ Organises and Controls Activities

↓

Prospecting → Exploration → Exploitation

↓

Article 140

→ Benefit of Mankind

↓

Article 145

→ Marine Environmental Protection

↓

Internationally Regulated Deep-Seabed Resources

Conclusion

The deep seabed beyond national jurisdiction, known under UNCLOS as “the Area,” represents one of the most important innovations in modern international law.

Unlike the high seas, which are principally governed by freedoms such as navigation, the Area is subject to a specialised international resource regime. Part XI of UNCLOS establishes that the Area and its mineral resources constitute the common heritage of mankind.

The most important rule is contained in Article 137, under which no State may claim or exercise sovereignty or sovereign rights over the Area or appropriate any part of its resources. Activities in the Area therefore cannot be based simply on the principle of “first discovery” or unilateral occupation.

Instead, activities are organised and controlled through the International Seabed Authority, within the framework established by UNCLOS and modified by the 1994 Implementation Agreement.

The system covers:

• prospecting;
• exploration;
• exploitation;
• environmental protection;
• marine scientific research;
• technology transfer;
• participation of developing States;
• equitable benefit sharing.

Environmental protection is particularly important under Article 145, given the potential effects of deep seabed mining on fragile marine ecosystems.

The distinction between the Area and the continental shelf is also essential. A State may have continental-shelf rights beyond 200 nautical miles under Article 76. Therefore:

Beyond 200 nm does not automatically mean “the Area.”

The Area begins only beyond the limits of national jurisdiction.

For examination purposes, the most important provisions are:

136 – 137 – 140 – 145 – 153

136 → Common Heritage

137 → No Appropriation

140 → Benefit of Mankind

145 → Environment

153 → Activities

And the most important institution is:

International Seabed Authority (ISA)

The most important case is the 2011 Seabed Disputes Chamber Advisory Opinion on the Responsibilities and Obligations of States Sponsoring Persons and Entities with Respect to Activities in the Area, particularly for due diligence, environmental protection and sponsoring-State responsibility.

Ultimately:

The Area is not the property of any State; it is an internationally regulated zone whose resources are to be managed for the benefit of mankind as a whole.