The invention relates to a propulsive system for a maritime vessel (1 ), the system comprising an oscillating or transversely translating sealing member (5) provided in the hull of a maritime vessel. The sealing member (5) is possibly connected to an oscillating power source and possibly connected to propulsive elements (4). The sealing member (5) is slide ably connected to the hull (2) allowing the sealing member to travel in multiple directions. The sealing member (5) covers the opening in the hull (3) and the opening in the hull will at any time lie within the area covered by oscillating sealing member (5). Sealing means (10) are provided for sealing the periphery of the opening in the hull.
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