Another Osprey is circling around a large asphalt area where are two Alien Grunts and is dropping infinitely many marines. Surface Tension ( map c2a5e ) / Marines / Infinite machine gun ammoĪt the end of this map inside a military base. This time you can collect the ammo, but it is very difficult to do it efficiently. Two marines will constantly drop from the Osprey with the same rules as the marines on the surface before. Open the shaft door, in the large vertical shaft with the large ventilator at the bottom. We've Got Hostiles ( map c1a3c ) / Marines You cannot collect infinite ammo as there is no effective way to kill the marines. As long as Osprey is operational and you keep killing marines, infinitely many will drop from it. ( you can using grenade jump, but you are not supposed to ).

Osprey is periodically dropping four marines behind electrified fence which you cannot get over. The open area has marines, an V-22 Osprey and the area is constantly bombarded with artillery. We've Got Hostiles ( map c1a3b ) / Marines They do always fall onto the ventilator and die. Above the ventilator is a hole with infinitely spawning headcrabs. There is a ventilation shaft through you which have to process to advance, inside is a horizontal ventilator that is spinning ( it will kill you if you don't crouch). The room with the flooded room and electricity. This is a list of locations sorted by game playtrough ( Holds true for every difficulty level ) Monsters/Enemies respawn only at certain locations.

Half life surface tension