Not even a teleport trap? Seriously, I don’t think I’ve ever seen a lab without one of those.
Other than that, though, some labs actually are impossible to escape. Ways I know of to escape:
-teleporter (easy if found, have to raise trapping the hard way if not… or impossible if no teleporters of any kind spawn, but I’ve literally never seen that)
-build an electric jackhammer (variably difficult - need to find a book with the right recipe (fairly common in labs) and get a real hammer (hard/rare) or install the Integrated toolset… and get electronics to 5, and some fabrication, IIRC)
-find a science ID (very rare - only ever seen that twice, both times in the a locker in the top right area in an observation-style room)
-make explosives (never tried this one myself - you need to find the right book for the recipes, and you are essentially required to put points into cooking)
-sewer exit (just plain luck - seen it a few times)
-I have found a jackhammer (and also a jacquehammer), but I’ve never found gasoline, but maybe?
-in theory, you could probably make a vehicle and run it into the door or a wall, but crafting a vehicle battery seems impossible (need lead) - everything else is fairly easy
-in theory, a brute from an observation room could evolve to a hulk, and you could lead it up to the top floor… but zombies don’t seem to follow across z-levels at the moment (same thing with getting several brutes to follow you, then hope they gang up on the wall somehow)
-hordes could spawn enough/the right kind of zombies to bash the walls down
-NPC could spawn with explosives (never had that happen in a lab, but I’ve seen NPCs with sufficient explosives before…)
-find and install hydraulic muscles, craft a homewrecker (not sure about this one - would that be enough to bash down a metal door or concrete wall?)
That’s all that I know of… but this topic has come up repeatedly, and I’ve probably missed a suggestion from someone, sometime.
