For the Seadogs: April 17th 1941. From:
SeaWaves Magazine
1941 - MS Venezuela sunk by U-123 at 53N, 18W
1941 - U-141 had a collision with the German ship Ameland in Bergen & suffered damage
1941 - Escort carrier HMS Attacker laid down
1941 - U-566 commissioned
1941 - U-573 launched
1941 - Destroyer HNLMS Van Galen (ex-HMS Noble) launched
1941 - Corvette HMS Monkshood launched
1941 - German raider Atlantis sinks the Egyptian liner Zamzam and takes 220 passengers prisoner. These passengers included "Life" magazine photographer David Scherman