Grimrock

I've been trying to get into the area shown in the spoiler below. I'm trying to avoid spoilers but I did look at an online guide and the area is undiscovered on their map too.
http://www.gamebanshee.com/showshot.php ... vel5_5.jpg

I'd rather not be told how to get in there, I just want to know if it's possible.

Thank you!
I'lll spend a bit more time on 6 then.

EDIT:
Found it! I searched there previously for an entrance but didn't notice it... Thanks for the hint.