Patrick Chovanec on Twitter: "The u-boat normally ran on the surface using its diesel engines (which needed oxygen and an exhaust outlet), reaching a much faster top speed of nearly 18 knots.
Type XXI U-Boat
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German Industries and the U-boat offensive - Technical pages - German U- boats of WWII - Kriegsmarine - uboat.net
Battery compartment in a surrendered German U-boat. Possibly Type XB U-234 or Type IXD-2 U-873. A special trolley allowed sailors to slide over for maintenance. Portsmouth, New Hampshire, 1945 (1200x703) : r/WarshipPorn
Smarter batteries help U-Boat Worx dive deeper for longer
U-boat - Wikipedia
Submarine snorkel - Wikipedia
How did diesel submarines, like U-boats, vent exhaust without giving away their position? - Quora
The Remains of the U-Boats' Watery Reign - Atlas Obscura
U 87 – Prosiect Llongau-U 1914-18 | U-boat Project Wales 1914-18
In WWII, when subs were submerged, but charging their batteries, was there a plume of diesel smoke? - Quora
German u boat attack hi-res stock photography and images - Alamy
Lost WW1 German U-boat wreck found off Norfolk coast - BBC News
SM U-118 - Wikipedia
Academy German Navy U-Boat IXB...1/150 NIB 603550014420 | eBay
German Industries and the U-boat offensive - Technical pages - German U- boats of WWII - Kriegsmarine - uboat.net
Academy GERMAN NAVY U-BOAT IX B IXB Submarine WWII Motorized SEALED 603550014420 | eBay
WWII Innovations: The Fruit of the Manhattan Project | The National WWII Museum | New Orleans
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U-boat Batteries - Technical pages - German U-boats of WWII - Kriegsmarine - uboat.net
The Nazis Ordered Their U-Boats to Fight Airplanes. It Was a Massive Mistake. | The National Interest
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U-boat Batteries - Technical pages - German U-boats of WWII - Kriegsmarine - uboat.net
Plugboats Guide to Electric Boat Batteries - Plugboats
U-boat Batteries - Technical pages - German U-boats of WWII - Kriegsmarine - uboat.net
U Boat Graphic 1 Stock Photo - Alamy
