A data storage system including a docking station, and a dockable external data storage device operates in an underwater environment. The dockable external data storage device includes a housing, a memory disposed within the housing to store data, and a connector assembly mounted on the housing. The connector assembly includes at least one optical transmitter configured to transfer data from the memory to a corresponding optical receiver in the docking station. The connector assembly also includes a self-passivating electrical contact configured to transfer electrical power to the dockable external data storage device from a corresponding power contact in the docking station.