Right now you only need to quietly deal with three guards. And since you started this jailbreak right after meal time you know you have hours till anyone will come to the slave pens, to wake you.
Options (after guards are dealt with)
- climb down the walls near the falls (possible spiders lurking)
- sneak past quaggoth's lair and take out guards at north end (there are two), and then climb down cliff face (no spiders, no wet rocks so safer climb)
-- both those options leave you with no food/way to carry water so survival checks a plenty, but possible
- Sneak to the kitchens (deal with whoever may be there) and get supplies, then sneak back to above options?
-- possible you are spotted by lift operators or they are having a party in the kitchens you knew nothing about, lol
- Cut bridges leading to lift so no reinforcements from quaggoth's other guard post, or shrine, then battle your way to the lift and down
-- A lot of combat could be troublesome as a stray crit could ruin your day.