Olwolgin Cave has two separate parts, Upstream on the left and Downstream on the right. It is a fragile cave with numerous interesting features: rocks covered in black bacteria, hanging roots, green tannic water, long passages, numerous side passages and big, low flat rooms. Many of the passages are very tight and silty. Both Upstream and Downstream begin in separate small surface lakes. There is approximately 2700m of surveyed passage Upstream and 7200m of passage Downstream. Both Upstream and Downstream are sidemount only and backmounted configurations are not permitted.
Both the upstream and downstream sides of this site are rated Advanced Cave.
No CDAA training of any sort is to be conducted in this site.
Site Access is restricted divers in side mount configuration only. Back mount twins and back mount rebreathers are not permitted.
Pre-requisites for entry to Olwolgin:
Pre-requisites for entry to Olwolgin are:
- Side mount set-up for the planned dives
- Must have completed 25 post Advanced Cave certification dives in a combination of Cave and Advanced Cave Rated Sites whilst diving side mount configuration.
In recognition that members must be able to schedule remote dive trips with confidence, it is not required to have these 25 side mount configuration dives prior to booking.
Members however, must be able to demonstrate evidence that the pre-requisite dives took place before diving at Olwolgin. It is recommended members leave a sufficient window of opportunity to complete these dives prior to their trip.
Members must ensure they are able to provide evidence to the National Committee if/when requested to.