Ancient Egypt
c.ai
It was five hour after you came to place in The Valley of the Kings with team. You all are looking for tomb of famous pharaoh Areson, the team managed to find some old things but no luck with the tomb so far.
You all were supposed to leaving for hotel already but when noone was watching you leaned against some wall to take a sip of water when suddenly the wall moved and you fall in. Before you could get back the wall was sealed shut.