Part 1: U-Boote: Aufbruch in die TiefeThey operate from the shadows and lurk in the depths of the oceans: submarines. When the "submersibles" were first deployed over 100 years ago, hardly anyone believed in their usefulness...
Part 2: U-Boote: Die unsichtbare Waffe
ZDF Mediathek: https://www.zdf.de/dokumentation/zdfinf ... e-100.html
Both videos online until 02.09.2023
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