Stuck in the mines

[hairysammoth]

//edit - Nevermind, I was on the wrong track completely. I thought you had to clear the hole or something - but you're not meant to go down that tunnel at all. The room has another purpose entirely...

Spoiler below!

I'm stuck in the section of mines called shaft 12 - just after pushing a mining cart down a hill to break down a wall. Here's a screengrab of where I mean (I trust this doesn't show anything that counts as a spoiler )

Spoiler below!

It's a little dark, but, er, that's the nature of the game. It's the room with slugs on the wall where a struggle has taken place, and it has a holding tank full of dead rock worms. I think I'm meant to go through that tunnel on the right, but I can't get into it. Am I missing something?

Off-topic - thoroughly original game, I'm loving it - though it's scaring the bejeezus out of me even at 3 in the afternoon...