Audrey: I'm trying to picture RV's and how they would have succeeded as such, and Pat's questions are plaguing me. You probably included other items besides food in the RV. Since the survivors would have gawked at the pyramids, scratched their heads and walked away in search of food, maybe the focus shouldn't be on food. Survivors would have been sorely lacking in tools, probably only having stones and ropes and it would take a while to set up a smelting plant, (gees, sounds like the AE's) by the time an entrance was made food may not have been an issue. Or are you thinking the RV's would also have housed the survivors who of course knew how to get out.
I think most of your questions above have been responded to in my reply to Pat's post here: [www.grahamhancock.com]
Keep in mind that the Subterranean Chamber of the Great Pyramid was not securely sealed, unlike the other GP chambers. It is believed to have had a stone block that swivelled open to allow easy access to this chamber. The Subterranean Chamber would have been an ideal location for the storage of tools etc that would allow access to the other chambers/pyramids. Inscriptions from Roman times show that this chamber was accessible long before Caliph A- Ma'mun breached the upper chamber in 820 AD.
It is extremely doubtful that the Recovery Vaults would have been used to shelter people - they were securely sealed and not easily accessed.