This text contains an assessment of the US role in the negotiations on the UN Convention on the Law of the Sea, and particularly in the negotiations on one of the remaining commons, the ocean floor beyond national jurisdiction. The study suggests that despite significant compromises negotiated between the US and developing countries at the Conference up to 1980, the emerging sea-bed regime was not as widely endorsed by US officials as is generally assumed.;Drawing on material collected from interviews with many key negotiators, the study contributes to a better understanding of domestic and international decision-making procedures and the dynamics of international negotiations.