Two daring divers have recently been fired from their previous jobs in the North Sea, but want once and for all to demonstrate their superior skills as divers. Therefore, they are planning an expedition all the way down to the wreck of the German warship "Blücher", which was sunk outside Oscarsborg fortress on April 9, 1940.
However, unknown forces try to hinder the divers' mission. This is because there are papers on board, with information that can not stand the light of day.
