 Freeman fights the Marines before reaching the surface of Black Mesa, where he learns that scientists from the Lambda Complex may have the means to resolve the problems created by the cascade. Gordon travels to the other end of the facility to assist them. However, Gordon encounters several hurdles throughout the facility, such as reactivating a rocket engine test facility to destroy a giant creature of three tentacles, using an aged railway system in order to get to and launch a crucial satellite rocket, and fighting a group of Black Ops soldiers, before he is captured by Marines and dumped in a garbage compactor. Gordon escapes and makes his way to an older part of the facility where he discovers an extensive collection of specimens collected from Xen, long before the resonance cascade.
