In 1980, on a desolate peninsula along the Norwegian coast, a cliff diving exhibition drew a large crowd. Thirty divers leaped into the unfathomable depths of the sea, but after the performance, none resurfaced. Rescue operations failed, with even lifesaving equipment being pulled into the depths. The next day, a diver discovered a powerful whirlpool at a depth of five meters, which contained not only the victims but also two divers and a mini-submarine. Strangely, some bodies were found chained at the ankles, and they had not decomposed. Who were they? Why do these mysteries remain unsolved?