1. Black Mesa Achievements
2. Permeable Infrastructure achievement

Black Mesa

1,077

50

4.42

10,366

818 (8%)

20-25h

Game action

• 2 want to boost

Cronollo

36

3

16 May 17

3h 2m

Permeable Infrastructure achievement in Black Mesa

Permeable Infrastructure

Use the alternate path in Office Complex.

0

23 January 2018 - 1 guide

How to unlock the Permeable Infrastructure achievement

• keoskey86,857

  24 Dec 2015 24 Dec 2015 24 Dec 2015
  1 0 0

  Here is a video that will show you where the alternate path is located
  Credit for the video goes to youtube user Costree.
  

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