As i've said till i'm blue in the face,
There is nothing to be done.
I suspect out of their 200k + followers, maybe 0.01% of them will ever even poke their head into an adit, even less then will actually set foot in and an even more minute percentage will take a step past any water.
The actual threat is the other youtubers trying to get to the same locations to put up on their own channels.
If you believe that any of their followers are going to go "Oh yeah look how unprofessional these guys are being!" Its just not going to happen. People care not for safety, they care for an entertaining watch, and evidently people DO find it entertaining.
There is nothing to be done, get over it and move on.
Encourage those who appear here and lets teach them the safe ways of enjoying this hobby regardless of how they wind up here.
FILTH - Think this is a playground? Think again...