You arrive on a wide ledge overlooking a large chamber. Jump off
of the ledge and head for the door to the far right. Open the door
and enter the wide corridor ahead. Follow this corridor all the way
to the door at the end, and take care of all the aliens along the
way. The door will open automatically, and reveal a large room: the
rest of the level behind a door to the left, whilst you can get back
to the satellite from the ledge to the right. Go through the door,
turn left and proceed up the stairs about halfway: on your right is a
corridor leading to switch 1. Flip this switch to open
platform A, revealing circuit panel 2. Destroy it, then
retrace your steps to the corridor down the stairs. If you head
north, you'll discover that the corridor rises suddenly, too steep to
jump or climb. Proceed to the lava-filled room in the north-east
corner of the map and observe the 5 teleporter cubicles there. The
lowest (second from right) is useful if you fall into the lava, but
the one you want to reach is the second from the left. You can't
reach it from your current position, but jump into the teleporter
nearest on the right and you'll reappear on top of the column in the
middle of the lava. From there you can jump to the desired
teleporter, but be quick before the column lowers into the lava. The
correct teleporter will take you to the upper part of the corridor
you came from (others will send you to previous areas of the map).
Open the door beside you, looking out for alien fire in the room
beyond. Cross the first platform and turn right and flip the switch
there. The first platform lowers and the second rises, allowing you
to reach switch 3, which should be revealed by now.
Return down the corridor and climb the stairs to the room at the
top. From there, jump across the corridor below to the far opening,
and head around to door C which is now open. Behind it is
switch 4; flip it and head for door D, which opens as
you arrive. In the room beyond it is circuit panel 5, which
will open door E allowing you access to the Alien computer.
Once you manage to destroy this mighty foe and its two guardians,
return to the satellite (via the room to the east).
Well done! Now, on to Non Dormit, Qui Custodit!