Sinn watch u2 s ezm 5 rubber u2 is sinns series of professional diving watches one feature that sets them apart from other diving watches on the market is the usage of german submarine steel in the construction it is protected from magnetic influences high pressure and the penetration of seawater the case is hardened through the usage of sinns tegiment technology additional functionalities include captive divers bezel with minute ratcheting crown at 4 o clock second time zone mission