Trigger Cave In

[Romulator]

Don't forget to add sounds and particles on top of this. That will make a huge difference

Indeed! Consider also looking at the level where the Kaernk (Water Monster) is chasing you. There is a section where the pathway forks, and whichever path you take causes a cave in. There might be some hints in the mapping there, as well as in script, for what you can do to make a pretty realistic cave in