Ghostboat - episode synopsis

Below is a synopsis for both parts of Ghostboat:

• Episode 1 - Jack Hardy is the sole survivor of a World War Two submarine disaster, who is astounded to learn his former vessel the Scorpion has resurfaced, miraculously intact. Recruited by Naval Intelligence to retrace the course and mission that led to her original disappearance, he soon finds himself fighting for his life

• Episode 2 - Hardy finds himself fighting to stop events as the forgotten happenings of 1943 start to have deadly consequences. Struggling to hang on to their identities, the Scorpion's latter-day crew discover that what's waiting for them under the grey waters of the Baltic Sea is far worse than the Russian submarines they expected