B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
B63C—LAUNCHING, HAULING-OUT, OR DRY-DOCKING OF VESSELS; LIFE-SAVING IN WATER; EQUIPMENT FOR DWELLING OR WORKING UNDER WATER; MEANS FOR SALVAGING OR SEARCHING FOR UNDERWATER OBJECTS
B63C7/00—Salvaging of disabled, stranded, or sunken vessels; Salvaging of vessel parts or furnishings, e.g. of safes; Salvaging of other underwater objects
B63C7/16—Apparatus engaging vessels or objects
B63C7/20—Apparatus engaging vessels or objects using grabs