Pollatoomary

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Cave details

Length:

< 1 km

Vertical range:

103 m

Region:

Co. Mayo

Also known as Pollflanagan. A completely flooded cave, which serves as the resurgence for Aille River Cave. The entire depth is underwater, making it currently the deepest sump in Ireland (and the British Isles), dived to 103m depth. The unexplored passage continues visibly deeper, and exploration is still in progress.