Deadfall. End 'gauntlet/maze/whatevs' after the jump and teleport

So, I've made it! Soloed it all, boss down, got the MAKR, jumped down and teleported - happy days..?

Nope. Got teleported to a pitch dark, proper cold place! Barely hanging on in there, but still alive, heh.

Struggling along, weaving thru all hell - after a bit, it opens up a to bigger room, well, cave, with a big-ass hill in the middle. Eventually found a ladder to climb and at the top I can see a faint light in a mineshaft on the other side, but the bridge across is broken. Is there another 'hidden' ladder/entrance/hole in the wall somewhere?

Anyone?

Thanks!