Secret Submarines in WWII

S4, E13: Secret Submarines in WWII

Available on FilmRise, Tubi TV
S4 E13: From silent one-man midget subs to U-boats on secret missions, both sides used secret submersibles of all shapes and sizes to conduct clandestine warfare in the war. An examination of the murky world of underwater "sneak craft" in WWII.