In the 1960s, Jochen Hasenmayer discovered and explored the first 400 meters of a large clam-shaped hole called the Aachhöhle.
The Speleonaut was designed in collaboration with Gehringer's friend, the cave diver Jochen Hasenmayer, who has used it since 1996 to explore the Blautopf cave system.
Exley and German cave diver Jochen Hasenmayer became friends and rivals in the 1980s, each repeatedly attempting to break the depth records of the other.
Jochen Hahn | Jochen Hasenmayer | Jochen Hippel | Hans-Jochen Vogel | Jochen 'Zeno' Roth | Jochen Wermuth | Jochen Neerpasch | Jochen Fahrenberg | Jochen Busse | Jochen Böhler |