You play as Thomas Redgrave. A scientist working in Area3 Research labs. The story is parallel with the events in Black Mesa, the same day when Gordon Freeman and Scientists in Sector C started the whole event.
It was a very good and long I especially liked that the first tier was with only the axe and the Glock with virtually no ammo, it was some challenge until we got to the HECU. The intro is really good with the tram ride and then the Hazard Course being messed up, and it was intelligent to make the journey parallel to HL1 (we see the ending from a different POV, like in Sweet HL), and Opposing Force (the ending, like in HL Black Ops... Oh god, so many mod's characters nearly crossed paths, in fact!), and there was some good action and puzzles, and of course the minigun sequence is pure fun.
Overall, a pretty good mod.
A very nice mod with some cool bits in it. The "vehicle" portion was awesome. I liked interweaving previously visited areas with new ones. A tad bit on the easy side but quite enjoyable. The axe was cool as well.
I did encounter one bug though. At the top of the flooded lift, the barrels are supposed to be moveable; mine were not. I could grenade jump into the vent but still...