Mod based on Xash 3D engine. The plot of the mod is an investigation around the Black Mesa incident, as a result of which the "Cascade Resonance" arose. The military unit on two trucks advances in the direction of the Black Mesa, but along the way, for some unknown reason, they are attacked by a military helicopter, the convoy of vehicles is completely destroyed, only one person survived. A Black Mesa employee passing by gives the survivor first aid and takes him to the nearest hospital. But on the way there, an unknown sniper kills the scientist. Player comes to life near the railway crossing, next to the corpse of a scientist. Fortunately, there is an emergency entrance to the Black Mesa complex nearby and, in order to figure out what is happening, it begins its journey into the depths of the complex ...
