TIL That WWI German U-boats were so difficult to combat that British sailors were ordered to try and break the periscope with a hammer to stop them. : r/todayilearned
Mint Germany Real Picture Postcard U Boat Submarine commander at the periscope | Topics - Militaria - Other, Postcard / HipPostcard
Closeup of a U-boat's periscope and "Runddipol" antenna.
U Boat Periscope In Use Stock Photo - Alamy
U-Boat Tactics: Submerged Torpedo Attacks
Torpedo Vorhaltrechner Project - Aiming with the periscope
Torpedo Vorhaltrechner Project - Aiming with the periscope
U-995 control room with periscope. www.deutscher-mar... My personal photo collection. | German submarines, Submarines, Periscope
German submarine U-1308 - Wikipedia
27 photos et images de U Boat Periscope - Getty Images
E60058 WWII German U-Boat periscope diorama – DID Corp.
Torpedo Vorhaltrechner Project - Aiming with the periscope
The new lungs of the U-boat: the Schnorkel breathing system, Stock Photo, Picture And Rights Managed Image. Pic. MEV-10653145 | agefotostock
The Hunt for the Notorious U-Boat UB-29 | History| Smithsonian Magazine
German U-Boat Periscopes
269 Submarine Periscope Photos and Premium High Res Pictures - Getty Images
Monkey Depot - Display: DiD U-Boat Periscope
DID 1/6 SCALE WWII GERMAN U-BOAT PERISCOPE DIORAMA SET, E60058 · Fairway Hobbies
Amazon.com: WWI German Submarine Ncaptured German Mine-Laying U-Boat Sm Uc-5 Showing The Conning Tower Periscope and Mines Photographed During World War I C1916 Poster Print by (24 x 36): Posters & Prints