He became trapped for 10 hours, but was freed after a major rescue effort . at the terminal sump beneath another large boulder choke, and the extension to this point was named " The Mayfly Extension ".
22.
Members of the Reyfad Group ( including the aforementioned Rev . Pitt ) and the Irish Caving Club worked together to dig their way into passage leading to a underground shaft, with boulder chokes and crawls at its base.
