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Taken at Jenolan Caves on the weekend. There obviously used to be a passageway through the middle of the bit of rock here, but it's been worn down and opened up, leaving a very cool pointy pincer type arrangement.

Taken using the built-in lighting in the caves (towards the end of the Imperial-Diamond cave from memory), curves and contrast tweaked a smidgeon.

I like the marbled/lined detail on the top of the shot: maybe increase the contrast to enhance the texture?. Ah... it's been years since I went to Jenolan...

Taken using the built-in lighting

I've taken a lot of cave photos over the years, mostly on film. Nearly all the best ones used this arcane lighting technique
Great capture BTW