Genesis pit
From Command and Conquer Wiki
The Genesis Pit was a large valley, where Tiberium contamination had reached critical levels causing mutation and rapid evolution of various Tiberian wildlife. CABAL along with Kane used it to observe the way Tiberium transforms terran life.
Despite the horrific nature of the denizens of the pit, civilian enclaves were located nearby, and considered themselves relatively safe. First, the bridges leading out of the pit had been destroyed, and second, there was a strong GDI presence in the area.
However, shortly after reactivation, CABAL suggested a Nod excursion to disrupt the GDI activity. A Nod Commander was dispatched, along with a small group of toxin soldiers, cyborgs, and engineers. Stealth being paramount, the engineers quickly and quietly repaired the bridges, while the toxin soldiers gathered the one thing that would ensure the creatures would encroach upon GDI territory: live bait. After drugging several small villages into compliances, the soldiers sent their unfortunate civilian assistants into the pit, and then back to the mainland. The chemicals used by the troopers had an side effect of accute blood poisoning, killing the civilians. However, their role in the plan was done.
The Visceroids, Fiends, and Floaters ended up rampaging, bringing about the destruction of civilian settlements and a moderately-sized GDI base and all of the personnel in it. However, a GDI commander was immediately dispatched to the area, and managed to hold the line long enough to ensure the evacuation of some civilian survivors.
The Genesis Pit was eventually destroyed by GDI.
