Deadly Fathoms (1973)

Rod Serling narrates a look at the consequences of the 1946 atomic testing at Bikini Atoll in the Marshall Islands Dubbed Operation Crossroads the tests included dozens of blasts that sunk a fleet of nearby warships Serlings narration follows a team of expert divers as they navigate the derelict warships Serlings expert narration combines with the otherwordly imagery to create a very interesting experience