Lol, Mashai Shelter is classified as a 2 man cave, it could barely sleep an anorexic goldfish! There is a photo on
www.berg.co.za under gallery - caves - mashai shelter.
There is an awesome cave (which I think I was the first person to consider properly, but I'm not sure) called Clam Shell Cave (named by me). I posted a thread on it a few months ago. Its 1km up the pass, got a better look at it when Mashai Pass defeated me for the second time this year last weekend (although this time the problem was more that I felt sick than the weather which was pretty bad). I don't know how well you know the pass, but after Pillar Cave Annex you cross the river to the left hand bank, you then go up a very deeply eroded path and just before you reach the sandy section and the river crossing you will see it on your left. This is a photo from around the Christmas Tree looking down at the cave (due to my sickness I didn't inspect the cave properly or get GPS co-ords):
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But really, other than the high theft risk of Mashai Shelter, it is an odd cave and is of little use.
Just a note on the pass, wind is channeled down it and due to land-slides its also very dusty and dust in your eyes, ears, nose, mouth, hair etc is a major annoyance. I'll be surprised if the pass isn't actually closed in the next few years due to this (if the errosion doesn't just make it impassable)...
If you have any questions or want any photos of the area, please let me know, I have around 1000 of them!