Mayday – A Swedish submarine is on a secret mission in the White Sea and you are the crew.
Suddenly you are hit by a torpedo. The captain stops the submarine on 25 m depth and leaves the control room to check the casualties, he will not return. Engine does not work, air pressure system is disabled, etc, and reserve air for 60 minutes has been started. The only way to escape from the submarine is to find out what the secret mission was and complete it before you run out of oxygen. Will your team make it?