Abstract: A temporary, reusable, movable hull patch for a damaged oil tanker hull having sides is disclosed. The hull patch comprising an upper track being rigidly affixed to each side of the hull, a lower track being rigidly affixed to each side of the hull and spaced a distance from the upper track, a body portion, four flaps framing the body portion and having four free edges, respectively, containing a resilient material so as to provide a good seal between the hull and the four flaps, the four flaps having a sealed position and an unsealed position, four pivots for pivotally connecting the four flaps to the body portion, respectively, four hydraulic cylinders for moving the four flaps from the sealed position to the unsealed position and vice versa, and two trucks attached to and riding on the lower track and the upper track.