One of TNT’s more infamous maps thanks to the final section, a huge room where hitscanners can shoot you without much cover. You’ll want to come in here with a partial invisibility so that the huge horde of enemies on the ground level will pick each other off. That way you can focus on the enemies on the ledges.
I actually found this map to be easier than Prison or even Wormhole for some reason, despite being worse designed than either of them. It’s a lot shorter, and even though the final room can be tricky, you’re at least better prepared for it. There are a few other instances of rough design like chaingunner closets you have to memorize, but it’s no worse than in a few other maps.
It’s really in Nightmare mode that this becomes one of the most difficult maps in the game. Endlessly respawning chaingunners without cover? No thanks!