After opening the blue door and then the large door you'll end up in an arena with pools of blood in the area below.Follow it along, head up the stairs, and into a control room, and the drone is in the back. When you reach the severed pipe on the bridge, cross to the other side, climb up the platforms, and double back - you'll need to double-jump around the first bridge support to get back onto the platform.Clear out the lab then head upstairs and the drone will head to the right when you approach him. Climb up a couple of steps immediately to your left, then jump across to the green-tinged rock and follow the walkway ahead. After leaping turn left and climb into an alcove, jump onto the box, and pull yourself up. After completing the cooling area objective, defeating the summoner, and heading outside, you'll come to a gap you need to jump over. The second drone is located above the hydroponics lab.

Approach where it was, jump down to the right, make your way round the rocky areas to reach a storage bay, and it'll be waiting for you at the end of a corridor to the left.

The first one starts off straight ahead as you climb over some crates after passing through the cave just after the rune.

In the first large open area, from your starting position, jump the gap to your left and head through the door.

Doom combat support drone