On the Spanish Costa Brava, gangsters trade in treasure that has lain at the bottom of the sea for hundreds of years. Teller and Kruger of the Punians, Romans and other historical peoples. Since the sale of the items is forbidden, the Spanish police ask the squids to stop the gangsters...
A ship is anchored in the port of Hamburg that interests several spies. The squids are used to secure it. A little later there are two dead: a diver and another man who throws himself in front of a car. But who is the mysterious man behind?
Pit and Tomy are investigating a smuggling case in the German-Swiss border area. The gangsters are helped by the invention of a professor who has developed a new underwater boat...
The squids search for a crashed plane off the coast of Nice. She does not know that a gangster couple is also looking for it. There are valuable things for her on the plane...
Mr. Lechner rented a submarine in order to be able to build on old times as a submarine diver. In an unobserved moment, the two children Peter and Monika climb into the boat and dive with it. They get tangled up in a tree trunk at the bottom and can no longer get up. The squids Pit and Tomy have to intervene...