February 11, 1971 (Xinhai Sixteenth), 63 countries signed prohibits the testing of nuclear weapons on the seabed treaty.

1971, 11, (history cn) 63 in a ceremony held in Washington, London and Moscow signed "prohibiting the testing of nuclear weapons on the seabed treaty, which prohibits the seabed and ocean floor and its subsoil placement of nuclear weapons and other weapons of mass destruction treaties. (L $ dj��.c��m) treaty in December 7, 1970, adopted by the 25th session of the General Assembly of the United Nations, the treaty came into effect on May 18, 1972.