Если почитать, то случаи находки бомб фактически единичны... http://archive.greenpeace.org/comms/nukes/ctbt/read3.html
2. 10 MARCH 1956: A U.S. Air Force B-47 bomber carrying two capsules of nuclear materials for nuclear bombs, en route from MacDill AFB, Florida, to Europe, failed to meet its aerial refueling plane over the Mediterranean Sea. An extensive search failed to locate any traces of the missing aircraft or crew.
пропал бомбер на средиземным морем. не нашли никаких следов. а нес две капсулы с ураном.
5. 4 JUNE 1962: A nuclear test device atop a U.S. Thor rocket booster fell into the Pacific Ocean near Johnston Island after the rocket had to be destroyed. The test was part of the U.S.'s first high altitude atmospheric nuclear test attempt.
6. 20 JUNE 1962: A second attempt to detonate a nuclear device in the atmosphere failed when a Thor booster was destroyed over Johnston Island. The nuclear device fell into the Pacific Ocean.
Самоликвидация ракет - боеголовки упали в море. не нашли.
7. 5 DECEMBER 1965: While the U.S. aircraft carrier USS Ticonderoga (CVA-14) steamed en route from bombing operations off Vietnam to the U.S. Navy base at Yokosuka, Japan, an A-4E attack jet loaded with a B-43 thermonuclear bomb rolled off the Number 2 elevator, and sank in 16,000 feet of water. The aircraft carrier was positioned about 70 miles from the Ryuku Islands and about 200 miles east of Okinawa. The bomb, aircraft and pilot were not recovered.
С авианосца скатился в море самолет с бомбой. не подняли.
+Аварий с подлодками еще десяток - вроде как ни одной не подняли. Я бы на месте какого Ирана или Сев. Кореи не ядерный реактор строил для своей программы - а батискафы :D