In 1995 South Australian cave diver Christopher Brown went another 20 metres further again, and in late 2008 much of the cave's more distant regions were explored, mapped (using radio-location "pingers" designed and operated by Ken Smith) and videotaped by Craig Challen and Dr Richard ("Harry") Harris et al. using hi-tech rebreather technologies.
1939: Hans Hass developed from the escape set a type of rebreather with its bag on his back and two breathing tubes but no backpack box.
On January 1, 1947, LCDR Thompson and Chief Petty Officer Dixon utilized "Jack Browne" masks and DESCO Oxygen rebreathers to log the first dive by Americans under the Antarctic.
Trainees become combat divers, learning to use scuba and closed circuit diving equipment to covertly infiltrate denied areas.