When you are fighting Hans Grösse, boss of episode 1, go to the main room,the one with all the wall hangings and rows of columns. Go to the left sideof the room, there should be three golden swastikas hanging on the wall.Walk up to the middle one and press SPACE. This will open a secret doorwhich leads into a room containing health, ammo, and the chaingun. Visitthis room before you take on Hans, and revisit it if you exhaust your ammoduring the fray, or take too many hits.