The Project Gutenberg eBook of The Diary of a U-boat Commander, by Anon
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The Remains of the U-Boats' Watery Reign - Atlas Obscura
German Submarine Activities on the Atlantic Coast
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The Remains of the U-Boats' Watery Reign - Atlas Obscura
U-boat - Wikipedia
U-boat - Wikipedia
Rig For Silent Running Painting by Mark Karvon - Pixels
SM U-5 (Austria-Hungary) - Wikipedia
German Submarine Activities on the Atlantic Coast
Wrangling a Runaway U-Boat | Naval History Magazine - April 2021 Volume 35, Number 2
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U-boat - Wikipedia
Permission to Come Aboard — Four Surviving WW2 U-Boats You Can Actually Visit - MilitaryHistoryNow.com
