The Drunken Lizard Pub

Thank you.
*wonders what's behind that cracked wall in the N/E*

I'm at the cracked cavern wall in the N/E section of level 2 of the dwarves mine.
I have 5 powder kegs total and can't destroy the wall.
I've reloaded numerous timed to nothing but a crack.
I"m after the final bell.
Am I in the right universe?

Thank you for the help.

Difficult to search and it's not in the manual.
I'm using a Mac and can't figure out how to use books.
e.g. Light Armour. I have the book, read it and still don't have Light Armour skill.