CS - Hostage rescure

Water_Desert_Road by: Spartan 172

Info:

The scientist's were driving a bud in a
middle of desert when they saw a house
and lots, lots of water. They decided to
stop by the house and ask can they drink
and collect the water, when one of the T's
in the housetook a bazooka and shooted the bus, 
only few of the scientist's were able to rescure, 
but they were captured by the T's. But the T's didnt
know that one of the scientist's called police
so CT's arrived at the place very fast!

CT's:
Rescue the hostages or kill the T's.

T's: Kill the CT's, don't let them to
take the hostages to the rescue point.

Hint:
At the right side of the map, there is green blood
and laser weapons and a secret machine! What it is?