Level 2, Dwarf mine question (SPOILER)

[Jlalal]

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?

[Jlalal]

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