In the Journal of the Royal Institution of Cornwall (publ 1886) – twenty pages of Victorian descriptions and drawings.
I was pleased to read (p301) that “Although difficult of entrance most of the company (including some of the ladies) scrambled into it, and made an inspection of it.” Not bad considering you’d imagine women to be encumbered by what they were wearing in those days. And it sounds rather spooky. The description on p246 seems to show a thinly disguised horror of rats, heavy atmosphere, dankness, and a ‘thick dark fog’, not to mention the ankle-breakers on the floor.