Komsomolets
In 1984, the Soviet Union introduced a super submarine that was the first of its kind. The Komsomolets was fast and could go to unbelievable depths. Five years after that, it sunk to the bottom of the ocean, killing two-thirds of the crew and taking nuclear weapons down with it. The sub sank 5,250 feet! Between 1989 and 1998, there were 7 expeditions that attempted to seal the torpedo tubes and prevent the nuclear reactor from releasing radioactivity. According to Russian sources, there was evidence of “unauthorized visits to the sunken submarine by foreign agents.”

Komsomolets
Pavlovsk Bay
Pavlovsk Bay is a secret underground base discovered by some explorers. Now disused, it was originally created to store Soviet submarines. It is believed that the base can survive a nuclear attack, but it looks like it got abandoned before it could be used since the Cold War came to an end. The explorers who discovered it gained access to a series of tunnels because of the frozen water in the area.

Pavlovsk Bay