The Cold War is very much in evidence in this mediocre outing. Nelson is sent down to investigate a mysterious object that has plunged into what appears to be 30 feet of water. Is it only a meteorite, or could it be an enemy ICBM warhead? Whatever it is, it's white hot, and it oddly retains its temperature during the entire episode, despite being in contact with water the entire time.
But the most preposterous aspect of the episode is the entirely arbitrary "ticking clock" that Mike has to work under. "Mike's got just 8 minutes and 13 seconds left to identify that thing!" What then? If it's a nuclear warhead, they'd all need to be 50 miles away when it went off.
Sorry, but I won't give away the "exciting" conclusion of this forgettable episode.