The Aowa is perhaps one of the best-preserved wooden steamship wrecks in the sanctuary. Its propeller shaft tunnel, with five shaft casing mounts still in place, is one of the most remarkably preserved features at the site. However, because it lies outside the other shipwrecks, Aowa is often in the path of rough water. During high tide, the wreck is also covered by water, making it one of the most difficult to get to. Since 1929, the ship has remained in the same location.