In order to make pushing this remote sumps in this cave a logisitical possibility we may need to use rebreathers. This is Chris Jewell's personal semi closed rebrerather - based on a 1.2kg scrubber lent to him byJohn Volanthen, a CDBA mouthpiece, an MSR water bag, a Dolphin ADV and a single cell monitoring system integrated with a VR3. 

The results are below, the whole rig is nice and compact and easy to transport.