The Sea War Museum Jutland made an amazing discovery while scanning the sea floor off Denmark. They have identified the wreckage of one of the most technologically advanced German submarines of World War II, the U-3523. The submarine was found with its bow buried in the mud and its stern rising from the seafloor in 123 meters of water, ten nautical miles north of Skagen.
The U-3523 was a Type XXI submarine and was the most advanced submarine of its time, capable of operating underwater almost indefinitely, relying on large battery banks which could be recharged by snorkel. The hulls were streamlined and more hydrodynamically efficient than other submarines of the period. They could also use hydrogen peroxide as a fuel and were capable of operating at up to 17 knots submerged for short periods.