
Following the brave divers who journey to the depths of the Baltic Sea to uncover its hidden war stories.

Within sight of Rügen, the Baltic Sea divers drop anchor to salvage lost plastic "ghost nets," which can prove deadly traps for sea creatures; diver Erik acts cautiously around the wreck of the fishing cutter Friedrich Engels that sank in 1973.

Together with research divers, the Baltic Sea divers try to capture unique images of harbor porpoises looking for food; they work to salvage a 17-meter-long ship that sank deep into the silt of the harbor basin.