This was done following Andrew Price's amazing "How To Make A Cave" tutorial. Since the textures used are from cgtextures.com, they're not packed with the .blend but you can still download the texutre pack put together by Andrew on the tutorial page http://www.blenderguru.com/tutorials/how-to-make-a-cave/#.U82_zvmSyom (Green button under the Finished Result photo)
Rendered with Cycles at 1000 Samples.
Thanks c; It's pretty ironic to lose data rduring a backup though, hate it when it happens xD
Looks awesome! I unfortunately lost mine in a backup though. :(