The Soviets dumped two reactor vessels in the Northwest Pacific. From 'Russian Arctic dumps hotter than realized.' Science. 260: 5105, 151. A B-50 bomber dropped a bomb that, according to one source, scattered 100 pounds of uranium into the St. Lawrence river. On Aug. 10, 1985, an Echo II class Soviet submarine's leaking reactor exploded while being repaired. Two weapons were jettisoned from a C-124 aircraft on July 28 off the east coast of the United States. They were dummy bombs, with no capsule. The problematic sodium-cooled reactor of the U.S.S. Seawolf was dumped here. An A-4E bomber armed with a nuclear warhead rolled off of an elevator aircraft carrier near the Ryukyu islands, killing the pilot. The plane and weapon sank to 16,000 feet, which is deep enough that it might have cracked the bomb's casing. A November-class submarine with two reactors, the K-8, sank in the Bay of Biscay on December 4th, 1970. The Soviet Union frequently dumped military waste in the Barents Sea, including: a nuclear submarine, the K-27; 18 reactors, about 7 with fuel still in them; and 7,000 tons of solid radioactive waste and 1,600 cubic meters of liquid radioactive waste. The Soviet Union detonated three nuclear weapons underwater in the Eastern Barents sea between 1955 and 1961. The K-159 was a rusty old first-generation nuclear sub that sank in a towing accident, killing nine of the ten sailors on board. The K-159 carried two reactors last refuelled 1972; it currently lies in 800 feet of water. The Kursk sank in 2000 after firing a torpedo and flooding occurred. It was raised with the help of a Dutch salvage company, Mammoet, and relocated to Murmansk; it was likely not carrying nuclear weapons, and its reactors no longer are on seafloor. The K-278 Komsomolets sank in 1989 after a fire on board. The submarine took its reactor and two nuclear torpedoes to the seafloor. The USS Scorpion failed to report on February 7th, 1967. Its hull was found several months later in 10,000 feet of water. U.S. Navy environmental reports indicate no leakage of plutonium or nuclear fuel. A Russian submarine, scuttled in 1986 after an accident that killed four sailors. There are 32 warheads with 200 pounds of weapons plutonium on board, at least some of which escaped from the hull. A United States submarine that imploded on April 10, 1963. All 129 men aboard were killed; the reactor presumably still lies on the seafloor.