Three of us take the new Flex rebreathers for a spin in Tank Cave, South Australia. The units are really starting to work well and as you'll see at the end of the video, are perfectly suited to some good old fashioned grovelling!

Shot on a GoPro 3, the divers get a bit dirty pushing through the connection between F tunnel and S18.

I hope you enjoy our new video intro, thanks to the comic genius of "Gong Man" Ken Smith!

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