Deep Wreck Mysteries.1of3.U-Boat Death Trap (2006, Documentary)

Three submarines are discovered deep off the English coast. No one knows their identity, or how they came to be there. New advanced techniques now allow divers to explore these wrecks. British and German experts join forces to discover the wrecks are German U-boats from WWII. Further investigation reveals a dark secret for the first time in 60 years, hinting that the British were systematically targeting U-boats and their crew. Will this new information give grieving relatives the closure they've been waiting more than half a century for?

Alex4History's supplementary notes:
Hosted by: Sweeney MacArthur
A United Kingdom - Canada Coproduction
Features: Innes McCartney (Historian)
Axel Niestlé (Historian)

The 3 sunken U-Boats:
https://www.uboat.net/boats/u400.htm
https://uboat.net/boats/u1021.htm
https://uboat.net/boats/u325.htm