Mothership Basement

Walk to the end of a long corridor to a T-junction. Kill the Skaarj and take a right, at the end of the hallway is a line of glowing purple beams. There’s a Super Health Pack at the end of them. Save your game before attempting to get through them. Try to face the beams and strafe sideways so you can always see what you’re doing.

After retrieving the pack go down the other side of the T-junction to a room dominated by a strange lift. Kill the pair of Skaarj then get on the lift at the centre of the room. After it’s powered up a light platform will rise, taking you up to the Mothership Lab.