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What's Left Down There, Part 3

I noticed that the first 2 parts got lots of fame and even ended up on the most popular page of the portal 2 workshop, so I decided to go along with the series

Series Backstory: The GLaDOS AI is under construction up above, You are an employee who was sent down with 2 others, You were told to go and see what was left down there from the old times, and try to salvage what you can for extra parts for GlaDOS. You and your 2 friends were walking when a section of the floor you were walking on collapsed, sending you, along with your friends falling. Both of your friends fall into deadly goo and die, and you are left hanging from a metal pipe, you manage to pull yourself up, and you are forced to go forward, There is no way back, you must go through the old tests.