A double-hulled tanker called Bernhard Dettmer refuels ships in Hamburg Harbor – power supply on board is provided by a Hatz SilentPACK diesel engine. It is end of the working day. Calm returns on board the Bernhard Dettmer, although the diesel engine is running, supplying the ship with power. There is no noise, however, because the engine is running very quietly. This is one of the outstanding features of the Hatz 4L41C SilentPACK engine. The Bernhard Dettmer is a double-hulled tanker, which is used as a bunkering vessel in Hamburg Harbor. Built in 2008, it is 100 m long and 9.50 m wide.