During July the ship drifted a further to the north. On the morning of 1 August, a pressure wave passed through the floe holding the ship, lifting the 400-ton "Endurance" bodily upwards and heeling the ship sharply to its port side before it dropped into a pool of water, afloat again for the first time in nearly six months. The broken sections of floe closed in around the ship on all sides, jarring the "Endurance" forward, backwards and sideways in violent fashion against the other slabs of ice. After over a quarter of an hour, a force from astern pushed the ship's bow up onto the floe, lifting the hull out of the pressure and with a list of five degrees to her port side. A gale overnight further disturbed the floe, driving it against the starboard side of the hull and forcing a sheet of ice upwards at a 45-degree angle until it reached the level of the scuppers. Despite the ordeal of the past few days, the ship remained undamaged.