Stingray - Season 1 - Eps 27: The Disappearing Ships
Troy and Phones discover a strange city of sunken ships when they search for three disused freighters that were to be blown up by remote control. The Nomads, who live in the sunken ships, are unaware of the timed explosives in their new requisitions and refuse to believe Troy. That is until one of the vessels detonates. The explosion jams the escape hatch. The second ship explodes but it is the nearby third one that could kill them. With only 10 minutes to go, they desperately manage to free the hatch and escape.
About Stingray

Title: Stingray
First Air Date: 1964-10-04
Last Air Date: 1965-07-04
Status: Ended
Rating: 6.8/10 (from 17 votes)
Language: EN
Seasons: 2
Total Episodes: 40
Network: Associated Television
Genres: Action & Adventure, Sci-Fi & Fantasy
Production Companies: AP Films (APF), ITC Entertainment
Synopsis
A British children's Supermarionation television series.
Cast

Lois Maxwell
Lt Atlantis Shore

Don Mason
Captain Troy Tempest

Ray Barrett
Commander Sam Shore

Robert Easton
Lieutenant George Lee Sheridan