a cave..(for the sink hole)

centuries past an old monk order had a shrine built deep under ground in an old cave complex, for a fallen hero and his legendary sword the protector of the realm.as time past and the last of the monks died ,so did the secret monk order and thus the where abouts of the shrine and sword. until now when a peasant was gathering old stones from a ruined chapel ,where he discovered a small jewel incrusted box,which contained a scroll.which when unrolled it started to disintegrate, all  part from a picture of a known sinkhole and its where abouts.it also indicated a cave entrance and a hilt of a sword. could this be the lost entrance .....go and explore... please note the water height is indicated by the entrance with a white tile,and should be set just lower..