This is a a discussion topic for the map "de_Substructure" by RedWood which can be found here
Map description:
de_Substructure is a bomb defuse map based in a underground structure of a vague purpose. (original and ambiguous!)
From the CT's prospective the map starts in a deep underground waterway and moves on a general upward direction to the T spawn point witch is at the top of the map. There is much more i could say but i'll let the screens do the rest.
