Sapphire & Steel - Season 2 - Eps 4: Assignment II: The Railway Station (4)
Steel continues to taunt the ghost of the solider but pauses when he finds Sapphire and Tully unconscious. A hallway in the railway station has become a re-creation of a submarine where three young men died from lack of oxygen. Sapphire and Tully nearly suffocate but Steel manages to carry them to safety before the three of them meet the same fate as the young submariners. Afterward, Sapphire and Steel agree to give Tully's methods a chance by holding a séance to find more information about the solider when he was alive.
About Sapphire & Steel

Title: Sapphire & Steel
First Air Date: 1979-07-10
Last Air Date: 1982-08-31
Status: Ended
Rating: 7.4/10 (from 23 votes)
Language: EN
Seasons: 7
Total Episodes: 34
Network: ITV1
Genres: Drama, Sci-Fi & Fantasy
Production Companies: Unknown
Synopsis
Sapphire & Steel is a British television science-fiction fantasy series starring David McCallum as Steel and Joanna Lumley as Sapphire. Produced by ATV, it ran from 1979 to 1982 on the ITV network. The series was created by Peter J. Hammond who conceived the programme under the working title The Time Menders, after a stay in an allegedly haunted castle. Hammond also wrote all the stories except for the fifth, which was co-written by Don Houghton and Anthony Read. In 2004, Sapphire and Steel returned in a series of audio dramas starring David Warner and Susannah Harker.
Cast

David McCallum
Steel

Joanna Lumley
Sapphire