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U-346 is a boat accessible salt water dive site, located in Hela, Poland. The maximum depth is over 150ft/46m.

Sunk 20 Sept, 1943 in the Baltic Sea near Hela, in position 54.25N, 19.50E, in a diving accident. 37 dead and 6 survivors

On 20 September 1943, the boat was undergoing diving trials as part of the 8th U-boat flotilla in Danzig Bay in the Baltic Sea; an unknown mechanical fault occurred, sending the submarine into a crash dive from which she never recovered, descending to the bottom of the bay, where she and her crew remain to this day. 37 people died on U-346, but unfortunately for the Kriegsmarine, the personnel aboard the boat were not regular U-boat crew, but a combination of the ship’s officers (who were all killed), and dockyard experts on submarine operating systems (six of whom escaped the wreck), whose loss was far more severe than the loss of the boat of its crew, had they been aboard.

Apparently she is an ideal dive site at 54 37’38"N, 18 50’40"E at depth of 49-56 meters.
According to the site she is located at 54 37’29"N, 18 50’26"E


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