Missing last alien in Terror mission "shelter"

[Precisionist]

I've played through this mission twice, each time going into every room (even checked the roof where the dropship is) and I cant find the last alien to end the mission.  Each time I've aborted, and it shows 1 alien still alive.  Not sure if there is a fix for this, but I remember a long time ago reading about a command you can type in to summon an alien in front of you if they are stuck in a wall or something.

This is the bomb shelter mission, the one with the gas truck in the middle of the map on a platform.

Any help would be appreciated.

[ShipIt]

http://ufoai.ninex.info/forum/index.php/topic,5948.msg48712.html#msg48712

[Precisionist]

FYI I finally got through this.  Apparently the key is to have the map spawn with the truck & lift at the bottom level.  Easy enough to save & replay before entering, rather than play through it only to find an alien stuck in a wall.