A few points:
1) Yes the forum you (Lemma) linked, is the one I am reading too (all the information I am giving is from there)
2) The picture is exactly the picture of the muddy branch, and in fact also the local guide who is reporting on the forum could not believe that a guide had led a group inside there, since it is pretty difficult to confuse that tunnel with something else
3) The sign was set in place by volunteers some time ago, but was not anymore in place at the moment of the accident
4) I have no idea about the youtube video; it is not from the same diving center and I don't know if they work in different ways
5) I don't think the guide was untrained for overhead; this will be clarified by the inquiry, but I consider it unlike
6) There are reports from survivors. The guide (not the local guide who unfortunately did not survive) who was the organizer of the divers managed to find the right way back and to lead a couple of them to the light
7) It is known that viz went completely out when they entered the muddy branch
8) The muddy branch can be explored, and actually it is, by highly trained and well equipped small groups
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If this is really the picture of the tunnel in which this accident happened, I am truely puzzled that the guide and the customers tried to squeeze in there. I know I am personally a very cautious diver but a tunnel that small and dark should really set of the alarm glocks of any open water diver out there.
The extremely sad moral of this story is that open water divers that are neither equiped nor trained for overhead have to stay out of the caves.
I don't know anything about diving, cave diving, etc. but I basically agree with you.
I find unacceptable that my life would be completely in the hands of somebody, and that in case of a mistake of him I would have no chance to survive.
Even if it would be required a *huge* mistake from him, as it appears in this case, this is not a safe system.