Go to the second level down the stairs in the under zone. Walk in the second level door, on the top left corner of the screen your cursors will look, then click. Now use the alien body then use the cable you will now climb down to the alien cave. This is the way out of the alien maze cave.

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After you get out of the cave take the blue key card off the table (this will unlock the door in the corridor
were the lab is). then have Lora take the hand off the dead body (this will give you access to the truck).The truck will take you to a docking bay. End of game.