|Cavers in the Nice Big Dry Tubes part of the Stormy Pot|
cave system on Mt Arthur.
The four-member Extreme Cave Team's second exploration of the Stormy Pot cave system, below the high tussock slopes on the mountain's northern side, took team members to a depth of 575 metres.
Team leader Kieran Mckay said the new system potentially dropped another 600m from the current point of exploration to where an underground river emerged into daylight.
Last year the team broke the country's cave depth record by finding the first cave in the country to go more than 1000m deep. Mr Mckay said Stormy Pot had the potential to drop to a record-breaking 1200m.
They exited the system late last week after a 14-day stint – five days of which were spent exploring the system from an underground camp.