Half Life, Chapter 6: Blast Pit

With access to the Silo D, Gordon mounts the old tram system to get to the Rocket Test Labs, a largely sealed-off area of Black Mesa dating back to its earlier days as a missile complex, now being used as a dumping ground for toxic waste from the rest of the facility, where the HECU soldiers have yet to get a good foothold due to the overwhelming amount of aliens and toxic waste in the area.

Arriving at the Rocket Test Silo, Gordon is warned of the Tentacles, a large alien creature blocking his way, and is instructed to fire the rocket engine to kill it before it keeps growing. But to fire the rocket he must first turn on the oxygen and fuel pumps as well as the power generator, after which Gordon is able to kill it by using the rocket engine to incinerate it. This uncovers a way out through the meters-deep dirt tunnel dug by the Tentacles, leading Gordon closer to Sector E's Materials Transport.

"Fire the rocket engine, destroy that damned thing before it grows any larger."
―Scientist

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