M451 was a WW2 German Navy minesweeper that sank 31st January 1944 south of Mäkiluoto naval fortress due to navigational error. The ship hit rocks and sank quickly. The crew was rescued by the Finnish Navy.
The ship lies at 32 m depth at the military protection zone of Mäkiluoto fortress, and requiring entry permission from the navy. Diving this ship requires special permission from the Military Museum of Finland. Our club has all these permissions.
The wreck had permanent buoys at bow and stern.