A winch is an object found in the digsite which can be used to enter the Digsite Dungeon. While the northeastern winch in the 'Private dig' section does not require a rope to be operated, the southwestern winch in the 'Level 2 digs' section requires players to use a rope on it to climb down. This does not use up the rope, however.
Using this winch gives the player access to a different area depending on the progress in The Dig Site quest. Players who have detonated their explosives to clear out rubble will get access to several Tin rocks, as well as a part of the cave containing several Skeleton spawns.