Longines watch hydroconquest hydroconquest profoundly sporty diving watches par excellence the models in the hydroconquest series are a homage to the men who have dedicated themselves to conquering the oceans and to enthusiasts of the open seas they meet the strict requirements demanded by this discipline they are water resistant to 30 bar or 300 metres are fitted with a unidirectional turning bezel screw down case and screw in crown lateral protection for the crown and double security