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Thanks for researching.
i alos googled this but couldn't find it.
i posted the question at break time at school. I then realised i had geography next so i asked my geography teacher who said e knew what i was talking about and that it is a cave next to a volcanoe that has sulphur fumes coming from it, filling the cave with sulphur.
But he could only vaguly remember the name of the cave.
So i told the vague name to the teacher who i originaly told about the cave. He then searched on google and couldn't find it and told me i was a bafoon (he does that a lot (in a jokey way) ). i then went back to my geography teacher and told him that my science teacehr had searched and couldn't find it. So my geography teacher asked who the science teacher was and he went to hunt for him (by this time it was 3.30 so i went home.