Resource development prompts reconsideration of ocean rules
By the mid-twentieth century, ocean navigation, coastal fisheries, seabed-resource development and marine pollution had become difficult to address separately. Newly independent countries sought a role in making the rules and greater control over offshore resources, while established maritime powers emphasized freedom of navigation and transport. The law-of-the-sea treaties concluded in 1958 had not resolved every disagreement, prompting new comprehensive negotiations.
In 1967, Malta's representative Arvid Pardo proposed at the United Nations that the seabed beyond national jurisdiction and its resources be treated as the common heritage of humankind. This initiative placed distribution of the benefits of deep-sea development on the international agenda and encouraged states to negotiate maritime zones, resource use and environmental protection within a single institutional framework.
Nine years of negotiations and a package compromise
The Third United Nations Conference on the Law of the Sea began in New York in 1973, started substantive work in Caracas in 1974, and continued in New York, Geneva and elsewhere. Hamilton Shirley Amerasinghe of Sri Lanka and Tommy Koh of Singapore successively served as conference presidents. Coastal, landlocked and archipelagic states, mineral-producing countries and others formed overlapping interest groups.
The conference pursued a package-deal approach, linking different issues in search of consensus. Three main committees addressed the seabed regime, maritime zones and resources, and the environment and research, progressively producing a unified negotiating text. Concessions on one provision could be balanced against gains elsewhere. This procedure made a comprehensive convention possible, while also prolonging negotiations for years.
Adopted in 1982, in force in 1994
On 30 April 1982, the conference adopted the convention in New York by 130 votes to four, with seventeen abstentions. On 10 December it opened for signature in Montego Bay, Jamaica. The term “1982 Convention” thus encompasses two phases, adoption of the text and opening for signature, while signature itself did not replace ratification.
Under Article 308, the convention entered into force twelve months after deposit of the sixtieth instrument of ratification or accession, which occurred in practice on 16 November 1994. Later participants had separate effective dates: China signed on 10 December 1982, deposited its instrument of ratification on 7 June 1996, and became bound on 7 July. A domestic decision to ratify, deposit with the depositary and treaty entry into force must be checked separately.
Rights in maritime zones and shared obligations
The convention limited the breadth of the territorial sea to twelve nautical miles, with foreign ships enjoying innocent passage subject to the applicable conditions. An exclusive economic zone could extend to two hundred nautical miles from the territorial-sea baselines. Coastal states held sovereign rights over resources and associated jurisdiction, while other states retained freedoms including navigation, overflight and laying submarine cables, subject to mutual due regard.
The continental-shelf regime addressed rights in the seabed and subsoil and could not be treated as identical to the regime for the waters above. The convention also made protection and preservation of the marine environment a state obligation. Resource use therefore involved more than extending control: it also required pollution prevention, respect for other states' lawful uses and fulfilment of cooperation duties.
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Renegotiating the deep-seabed regime
The convention called the seabed, ocean floor and subsoil beyond national jurisdiction “the Area.” It prohibited national appropriation and established the International Seabed Authority to organize resource activities there. Some industrialized states nevertheless opposed the deep-seabed mining regime in Part XI, so adoption of the text did not immediately remove political barriers to participation.
An implementing agreement adopted on 28 July 1994 adjusted that regime. Its annex required access to technology on fair and reasonable commercial terms and revised production policy. The agreement and Part XI were to be interpreted together, with the former prevailing in case of conflict. The agreement was provisionally applied from 16 November 1994 and formally entered into force on 28 July 1996. These stages cannot be compressed into a claim that the convention was fully operational in 1982.
Operation through institutions and cases
The convention created implementation mechanisms of different kinds. The Commission on the Limits of the Continental Shelf examined scientific and technical information on outer limits and made recommendations; the International Seabed Authority dealt with resources in the Area; and judicial or arbitral bodies, including the International Tribunal for the Law of the Sea, handled particular disputes. Part XV also contained jurisdictional limitations and optional exceptions, so not every maritime disagreement automatically went before the same tribunal.
In the 1999 M/V Saiga (No. 2) case, the International Tribunal for the Law of the Sea examined Guinea's seizure of a tanker flying the flag of Saint Vincent and the Grenadines. It found that the hot pursuit lacked a legal basis and that force exceeded what was reasonable and necessary, awarding more than US$2.12 million plus interest. The judgment separately examined implementation of the earlier prompt-release proceedings. The case shows that implementing the convention required fact-finding, procedural choices and state cooperation, rather than following automatically from the existence of treaty provisions.