Sinn EZM 3 S Silicone Watch 603.011 Silicone. Diving missions under extreme conditions push both people and equipment to the limit – and often beyond. In icy depths, under massive pressure, or in near-zero visibility, absolute reliability is essential. For these kinds of professional operations, we developed the EZM 3 S, a mechanical technology basis that embodies the very essence of a SINN watch like few others.