Given the name of the clip "Into the Light" and the hint by conorjclarke of Oman, then I reckon it's Majlis al Jinn, which is one of the largest underground chambers in the world. Here's the Wikipedia entry for it: http://en.wikipedia.org/wiki/Majlis_al_Jinn Note the shot of "Cheryl's Drop" where the background looks remarkably like that in the clip. The area around the slot isn't too dissimilar either.
Is that the same Majis al Jinn whose access was "...closed since Red Bull staged a base jumping stunt there ... (and allegedly didn't bother to clear up their mess after)".
> Given the name of the clip "Into the Light" and the hint by conorjclarke of Oman, then I reckon it's Majlis al Jinn, which is one of the largest underground chambers in the world. Here's the Wikipedia entry for it: http://en.wikipedia.org/wiki/Majlis_al_Jinn Note the shot of "Cheryl's Drop" where the background looks remarkably like that in the clip. The area around the slot isn't too dissimilar either.