He said: "I think the person who made the comment is genuinely seeking to be helpful. The forum is punctuated by comments highlighting the dangers of this quarry."
He added: "We have a policy not to censor comments but do remove anything that promotes bad diving practice," he said.
A diver, calling himself "Sheepboy", wrote of Bryn Hall: "The place is deep, dark, full of rubbish, barbed wire all over the place, dead sheep, cars and unexploded bombs, not forgetting the poor soul that is still in there."
The disused quarry, owned by Penrhyn Estates, has been fenced off several times.
