The Hydrosphere collection offers an original version of diving instruments with a single hand on the dial. Ingenious, the watches are equipped with an operating indicator at the base of the needle in the form of a disc rotating to the rhythm of the seconds. The unidirectional rotating ceramic bezel with a double scale to ensure the reading of the time at different diving depths. Each model is equipped with a helium valve to release helium bubbles trapped in the housing, thus preserving its functional integrity during decompression.