Another double bill of digitally remastered episodes from Gerry Anderson's fifties subaqua science-fiction series.

6.00 Treasure Down Below
The crew of Stingray embark on a perilous adventure when an old map reveals the location of some hidden treasure.
(R) (S)

6.25 The Big Gun
The formidable firepower of an unknown undersea race leads Troy Tempest to steer Stingray to dangerous depths.
(R) (S)

[NB this series was from the 1960s not the 1950s]