More from Tawi Atayr – unfortunately it was the wrong time of day, so shadows in the sinkhole were very dark. It was also before the monsoon hits, so everything is brown & tinder dry.
The metal rusted & broken frame seen on the last image, was for taking water from the bottom of the sinkhole during the summer months. During severe monsoon periods, this place can fill with water, then join the deluge that pours down Wadi Darbat towards the sea; such as when Cyclone Mekunu caused flash flooding earlier this year.
Getting there & seeing the place was great fun (even if rather precarious when venturing near the edge and away from the installed viewing area) but needs must for photography, as long as one is sensible.
David A Lockwood 
You said that you don’t think anyone has explored the cave system at the bottom of the sinkhole yet?
Sorry, what I meant was that passages at the very bottom (some under water) had as far as I know, not been explored.
Oh, that’s fine. Exploring cave passages does sound fun, but not ones that are under water!