Pollatoomary

Pollatoomary is the deepest explored underwater cave in Ireland. It has been explored to an underwater depth of 120 metres (390 ft). The explored limit of Pollatoomary is also 33 metres (108 ft) deeper underwater than that of the terminal sump in Wookey Hole Caves in Somerset, England, which previously held the record for the deepest underwater cave in Great Britain and Ireland.