I hope I'm not the only one who feels uncomfortable about putting a sign on the Pit though. The implications associated with this response to the incident go much further than just dealing with this one hazard. I can see pros and cons and I'm more than happy to go with the flow if there's massive support for it. But I don't like the idea. In the same cave system not so long ago there was someone who free dived into Mud River Sump 1, believing it to be Rowten Sumps. Mud River Sump 1 is getting on for 30 m long. There was talk at the time of putting a sign there to warn people that it's not the Rowten Sumps. We dealt with this in what I feel is a more appropriate way (the line was rebelayed underwater so "normal" cavers probably wouldn't see it).
You can't put warning notices up on every hazard in a cave system. Think what happens if a sign disappears, say, due to a flood, or someone who disagrees removing it; the next group assumes they're going the right way because there's no sign telling them otherwise. There may be better ways of achieving the desired objective.
Well said, pitlamp