Bikini Atoll, South Pacific, 1954.An aircraft carrier stationed near the Marshall Islands, witnesses the most powerful nuclear test in history, the terrifying "Castle Bravo" shot. But the test runs wildly out of control and creates the first true thermonuclear detonation. The carrier is hit by a blast that incinerates many of her crew. One young seaman, Ernie Walker, leaps overboard to escape the blast.Present dayA fishing trawler picks up an old...