There's a door on one of the walls of the Fortress, which you go through to go blow up the ammo and save your friends. Head down the path in there in which you went to save your friends, and go through that thing again to reach the room the game started at.
Outdated Plat-bar by ThunderStick, sig by Bladia, avatar by ROBO3AG13
Click the sig and be whisked away to my checklist! Or click here to visit my YouTube channel!