Marine surface vessel

A marine passenger vessel extending in a longitudinal direction between a bow and a stern, comprising:

• least one power providing apparatus operatively connected to at least one propulsion unit for propulsion of the vessel,
• a fuel tank arrangement for storing gaseous fuel in a liquid phase, connected to the power providing apparatus by means of a gas supply system for running the power providing apparatus, and
• a plurality of decks distributed vertically, one above the other, the fuel tank arrangement comprising two tank sub-arrangements, each tank sub-arrangement comprising at least one gaseous fuel tank, each fuel tank extending vertically past at least two of the decks, and at least two of the decks, past which the fuel tanks extend, each presenting a passageway,
• wherein each of said passageways extends in the longitudinal direction of the vessel, from a portion of the respective deck aft of the tank sub-arrangements to a portion of the respective deck forward of the tank sub-arrangements,
• wherein each passageway extends between the tank sub-arrangements, there being one, two, three or more tank sub-arrangements on each side of the passageways,
• wherein each of said passageways is adapted so as to provide for persons and/or items to move or be moved through the respective passageway, the passageway being provided as a corridor between the tank sub-arrangements, and being of a width and height which makes it suitable for movement of passengers through the passageway.