Crystal Cave is a cave in the British overseas territory of Bermuda. It is located in Hamilton Parish, close to Castle Harbour. The cave is approximately 500 m long, and 62 m deep. The lower 19–20 m of the cave are below water level. The cave formed at a time when the sea level was lower; as the sea level rose, many cave formations which formed above water became submerged.
A tourist attraction since 1907, it was discovered in 1905 by Carl Gibbons and Edgar Hollis, two 12-year-old boys searching for a lost cricket ball. Soon after, the Wilkinson family learned of the discovery. Mr. Percy Wilkinson lowered his 14-year-old son Bernard into it with a bicycle lamp on 140 feet of strong rope tied to a tree to explore the cave.
Wikipedia https://en.wikipedia.org/wiki/Crystal_Cave,_Bermuda
Address Crystal Cave Road, Hamilton, Bermuda
Coordinates 32°20'58.42" N -64°42'48.141" E