They could mix up some concrete to entomb you if you're holed up in a "defensible position" in the caves.
Or build a nice bonfire in the vicinity, giving them options involving oil, choking smoke, or even pure heat.
IOW, they will react. The question of HOW is dependent on their resources and your party's particular location, etc.
Warning, anecdote time:
When I joined my first 1ed game years and years ago, the campaign was a couple of years old already, so the PCs had quite a few levels. Of course I got told endless stories of what had already transpired in the campaign, and among those was this:
The PCs were attacking a huge, huge evil city on their own. Resting - raiding - resting - raiding. They had a tiny magical gem that contained a pocket universe, and used that as a base, popping in and out of it as necessary. The city was underground, a maze of corridors and caves carved from the rock, so it was trivial to find a crack in the wall in an unused cave as a secure hiding place for the gem, so the PCs thought it to be the perfect setup.
Well, the GM was extremely simulationistic, so he had already used his trusty population formulas to determine how many evil clerics of the appropriate level the city had. From that he got how many yes/no divination spells could be cast during the PCs' rest time.
So the evil clerics determined what half, quarter, eigth, sixteenth, etc of the city the PC were in. They got as far as singling out a city block before the time was up. So, being evil, they cast Rock to Mud on the entire block, population be damned. When the PCs popped out of their cosy pocket universe a little later, they emerged in a torrent of mud already being swept down a dark underground river into depths unknown...
From that anecdote I learned not to be complacent about rests and the 5 min adventuring day.
PS. I said the city was huge. I got shown the maps afterward, and they were a 7cm (3inch) stack of A4 graph paper using 5mm squares.... Those were the days of a grandioser scale...