Head right and look over the railings to your left and you'll see a small platform poking out. Stand by the corpse holding the yellow key and look towards the large fan.When you enter the semi-circular room in the VEGA terminal, turn left and climb the pile of crates, jump onto the ledge, and the collectible is at the far end of the vent.Head into the vent just to the left to find this guy. Follow it round and climb to the roof of the building, then head across to the far side, to the short flight of steps. You'll spot a crate with blood smeared along one edge - use it to reach the ductwork above, head up the slope a little, and then turn and jump up to the next duct. After opening the airlock and returning outside, fight off the first wave of enemies and then head to the platform below the objective marker.Turn left and the collectible is at the end of the passageway. Pass through the stone arch ahead and follow the green lights until you find some UAC crates on the ground. You'll come to an area just past the field drone that's got a drilling machine and what looks like a crashed escape pod in the ground.Once you've collected the blue card, jump onto the crate the body is leaning on and then jump up to the ledge with the green lamp.If you're interested in other hidden things, our Doom secrets and collectibles guide can help. Locations for these toy Doomguys are listed in the guide below. There are 26 variations in all, collect them all and you'll be rewarded with the Trophy/Achievement 'Every Nook and Cranny'. On every level of Doom there are two action figures of our hero Doomguy in various colours to find - the game's menu calls them 'model collectibles'. This one's just for the collectors and completists - and there's nothing wrong with that, of course.

Doom 4 level 1 secrets