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HMS Tarpon is a boat accessible salt water dive site, located in Thyborøn, Denmark. The maximum depth is 121-130ft/37-40m.

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On April 10, 1940, British submarine HMS Tarpon and its crew of 50 were sent to Norway to intercept Nazi merchant vessels. They were was never heard from again. Now, after 76 years, the sub has finally been found. An investigation of the remarkably well preserved vessel shows it didn’t go down without a fight.

The wreck was discovered earlier this year by Gert Normann Andersen, who runs a Danish war museum, and Innes McCartney, a British marine archaeologist. The shattered remains of the vessel, a 275-foot (84 meter) T-class submarine of the Royal Navy, was found in the Danish section of the North Sea, about 50 miles (80 km) from the harbor town of Thyborøn.

The submarine was dispatched from Rosyth, Fife, in order to attack German merchant ships that were supplying arms to Nazi-occupied Norway. German war records show that the British sub attacked the Q-ship Schiff 40/Schürbek, but its torpedoes missed their mark. The German ship then managed to pick up the Tarpon on its sonar, and its periscope was spotted. The Schürbek dropped batches of depth charges in a sustained attack that lasted the duration of the morning. Finally, a calculated series of depth charges struck the ill-fated submarine, causing debris to float to the surface. 50 British crewmen were killed in the attack
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