limeyx:agreed (for once !) Abort the dive, and make sure the "key guardians" are aware what is going on down there.
EDIT: And this for me is a bit less of "liability" than it is -- what if I am coming out of the cave in a "hurry" -- some emergency happened. Am I going to run into a huge cloud of silt or people laying all kinds of line in all kinds of crazy places.
it would be a question of personal safety, and why risk your life?
if this is a site where more often than not people who are not cave trained are present at the entrance, I would probably consider other sites to dive at.
The OW divers that go in there aren't running lines. With the flow, their silting isn't going to cause you problems trying to exit (not that it should anyway).
Besides how can you get more of a line mess than there can be be at at places like
P1. I've seen so many lines run in there at once that it looked like a spider web. LOL
As far as picking a different cave dive...yes that's probably best. I've dived vortex while helping with a survey and after teaching days there. Otherwise, I go someplace else.