Petter is a commercial offshore diver in the North Sea during the 1980s. Norway is at the beginning of its program for oil harvesting. Petter and his brother Knut have key roles in laying the first petroleum pipe in the North Sea. Norwegians and Americans are cooperating in diving deeper than anyone previously has done, to prepare for the installation of a gas pipeline. Petter experiences a tragic accident during a test dive. When he later tries to find out what really happened, he finds that the authorities and his colleagues are trying to cover up the matter.