1: Start up your game

2: Press escape to bring up the black screen

3: Press TAB to open the console

4: Type in the console (without the inverted commas): "open Pipeline", then press Enter

5: Wait for the map to load. Once it has opened, press TAB to open the console and type "playerlock 0", then press Enter

6: Open the console again, and type "mpcheat ghost" and press enter

7: Fly to the exterior maintenance valve. Instead of going into the building, go around, and fly through the wall to the clump of trees at the far corner of the rear wall.

8: Look!

And here is the new Yeti, with its hand stuck in the wall, and it trying to pull it out :D

You'll also notice that the yeti has dissapeared from Weapons Cache SE.