DOWNLOAD: http://hl2-beta.ru/download.php?view.56 Another HL2EP2 mod, this time based upon "the depot", a cut location from the coastline.
Originally, after traversing a network of Antlion caves (which were cut from HL2 but reused in Ep2), Gordon was to (for some reason) hitch a ride on a Wasteland Train. This would take him to the Combine train Depot, which was located by an old, abandoned prison.
Somewhere in the Depot, he would find Gunship Bays - as the name suggests, this would be the location where Combine Gunships were built. After fighting off the Combine, the Gunship Bays would be destroyed, and Gordon would head into the Depot itself and hitch another train-ride to the Air Exchange. There, he would meet Alyx (possibly for the first time in the game!), her father (who was then a military commander/rebel spy for the Combine), and his army of Conscripts (human soldiers under Combine control).
A fight of some sort would ensue, resulting in the Air Exchange's destruction - thus inciting the Human Uprising.
In the final game, the Depot and abandoned prison levels evolved over time, eventually combining with both the Air Exchange (triggering the Uprising) and the Weather Control (facilitating Alyx and Gordon's return to C17) to create Nova Prospekt.
I must admit, while I know that this mod is based on some of the concepts for the Depot/Prison, I don't know if it's actually based on any early maps - I haven't looked just yet.