This underwater habitat was Germany's entry into the quest for expertise in Marine Engineering. Its first mission took place in 1969 off Heligoland at a depth of 25 metres. It is devided into a so called "wet room" and a "dry room". The wet room serves as an entrance to the habitat and allows divers to comfortably don and handle gear before and after an EVA. The dry room contains living qaurters and a laboratory.This habitat is technically a huge diving bell for saturation diving. Divers go on exkursions and return to their habitat where they are subjected to ambient pressure. After the mission is over, the entire habitat is refloated and doubles as a pressure chamber for decompression.The habitat is not entirely self-sufficient-apart from a number of scientific packages the habitat was linked to a utility buoy which housed generators and compressors. A number of surface vessels provided support