Ascent rate indicator mechanism and diver's watch comprising such a mechanism

A diver's watch comprising a mechanical or electromechanical movement, and an ascent rate indicator mechanism comprising:

• a first wheel set and a pressure sensor, the pressure sensor configured to deform mechanically under a pressure variation in a surrounding medium and configured to actuate the first wheel set based on the pressure variation,
• a second wheel set driven by the first wheel set in a single direction of rotation, the second wheel set configured to rotate from a start position into a measurement position corresponding to an ascension rate representing a rate of decrease in pressure measured by the pressure sensor over a period of time,
• an uncoupling and returning mechanism configured to reset the second wheel set by uncoupling the second wheel set from the first wheel set and configured to return the second wheel set to the start position at an end of said period of time,
• wherein the second wheel set is configured to rotate an ascent rate indicator to a position representative of the rate of decrease in pressure measured by the pressure sensor over the period of time,
• a first return mechanism to return the ascent rate indicator to the start position,
• wherein the ascent rate indicator rotates in a first direction to indicate an increase in the ascension rate and rotates in a second direction opposite to the first direction to indicate a decrease in the ascension rate, the rotations in the first direction and the second direction are respectively caused by an increase or a decrease of torque in the first return mechanism, and
• a synchronizer configured to maintain said position of the ascent rate indicator during said period of time.