An assembly in a marine vessel comprising a unit (2) arranged in a watertight chamber opening in the hull of a vessel, the unit being adapted to extend into the water below the vessel when in the mounted position of the unit, A sealing system 604 is provided in the connecting path and the sealing system 604 connects the connecting path 630 to the outer connecting path portion 630. [ (630 ') and an inner connection path portion (630 "). The assembly includes a gas injection system 640, 640 'open to the external connection path 630'.
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