I was trying to find my way out of the sewers, and had managed to climb three levels (I wasn\'t so far down, probably no more than a couple more flight of stairs).
I was walking along, I had just passed two big ladders in the middle of the tunnel that don\'t appear to be climable, when whoosh! Things went black and the arrow started leaving trails all over the screen.
I quit using the usual (X) button in the top left, and got an OSX message that the game had error-quit.
On reopening, I was dead. Wtf? Is this is a glitch, or are there actually hell-mouths all over the sewers?