Deep within a mountain in Albuquerque, New Mexico, a Cold War-era nuclear weapons storage facility is being used to covertly receive more than 100,000 tons of nuclear waste stored across the U.S. The Department of Energy employee, Adonia, and a few others, including a war hero, a senator, and an environmental activist, are allowed access to perform a high-level security review of the facilities. But Hydra Mountain was never meant to securely hold this much hazardous waste, and it has the potential to explode, taking with it all of Albuquerque and spreading radioactivity across the nation. This disaster situation proves all too possible when a small plane crashes at a nearby military base, setting off Hydra's lockdown and trapping Adonia and her team in the heart of the hazardous, waste-filled mountain. Now, the only direction for them to go is deeper into the mountain, through the tear gas, and into a secretive area, no one was ever supposed to know about.