WWII: Hell Under the Sea

German U-Boat commander Gunther Prien is recalled from patrol early and offered a secret mission to strike the Royal Navy at its home port. All ages. (S3, ep 1)

September 1939. The life of German U-Boat Commander Fritz Julius Lemp takes a series of dramatic turns as he risks the wrath of Adolf Hitler. (S3, ep 2)

It's December 1944, and with a German U-Boat circling for another shot, the crew of a merchant ship must hold out until help arrives. (S3, ep 3)

After a lacklustre wolf pack operation, an American submarine commander penetrates the defences of a Japanese convoy in the Luzon Strait. All ages. (S3, ep 4)

After facing down three destroyers in the Japanese occupied harbour of Kiska, Alaska, an American submarine takes the fight to the south Pacific. (S3, ep 5)

Discover the story behind the Submarine Lifeguard League, which mobilises to risk everything to rescue downed aviators in enemy waters. (S3, ep 6)