Film query...

Ttttttttt

New member
Can anyone remember a film back in the seventies I think, that really freaked me out when I saw it on the tv aged 7 or theirabouts?! All I can remember is that these people on holiday (it's set in the States), go into a cave to do a bit of pot-holing I think, and whilst they're in the cave, I think there's an earthquake or something. When they get out of the cave, everyone's missing, including their friend who was too ill to pot-hole and was lying in the back of their camper van. Anyway, they go around the place and try and find anyone alive, and find a few who were inside - the rest seem to have turned to sand. I can't remember the ending, and to be honest, it's probably a terrible film on rewatching it, but it left a real impression on me. Does anyone remember it and have the title?...
 
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