That was one fun dungeon romp!
It's part of the main quest, you'll get back to it. However, you can get a Berserker sword there even before doing it as part of the main quest. It's in the room outside the blue barrier, near one of the pillars.
Did you read the column in that room? It gives you a map of that area, and shows the location of the other winches.
Keep hitting the switch in the middle room (I think you have to break down a wall to get to it), it will open the other doors. Every time you hit it, one door will open, while another one closes.
I finally beat this blooming dungeon maze, and now I feel I need a holiday… but alas, no such thing for gamers who game weekends - so on to the next piece of armour!
For me, the 'thing' that stumped me for a good while was finding that last winch. You have to sorta think 'Zelda' here.
There is a button on a wall that you cannot reach. There is lava down below the button. Shooting that button with your crossbow or bow does the trick.