The Type VII U-Boat, submarines of the Kriegsmarine, are today's subject.
Read more about the subs here:
https://www.amazon.co.uk/U-boat-evolution-technical-Submarines-Military/dp/0304361208
https://www.amazon.co.uk/Type-VII-Germanys-Successful-U-Boats/dp/1848321414
https://www.amazon.co.uk/Type-VII-U-boat-Anatomy-Ship/dp/0851773141
Naval History books, use code 'DRACH' for 25% off - https://www.usni.org/press/books?f%5B0%5D=subject%3A1966
Free naval photos and more - www.drachinifel.co.uk
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'Legionnaire' by Scott Buckley - released under CC-BY 4.0. www.scottbuckley.com.au