A depth meter is an instrument used by divers and submarines to know at any moment the depth at which they are. It is an essential measure for their survival and security in a hostile environment. Divers wear their depth meters attached to their wrist thanks to a simple rubber bracelet, just like a watch. Submarines are equipped with depth meters located in the machinery room. The RESERVOIR Tiefenmesser, which means depth meter in German, is inspired by these measuring instruments found in vintage submarines.