During navigation it sometimes happens that we stop for various needs, take stock of the ship, check the GPS, look at conspicuous points on the ground to detect the position, or simply to rest and swim. And sometimes we happen to find fish that strangely take shelter under our hull. In this case we are about 7/8 miles from the coast, therefore practically in the open sea, while with the engine off we were trying to check the seabed with the sounder to look for a new dive point.