I expect the dart toxin was produced in an underground lab.

The preemies were shipped to an underground lab called the School.

We're also interested in getting at the core of the problem: the coaches, trainers, doctors and underground labs.

Several federal and state police agencies had been searching frantically for him since he'd broken out of the underground labs in Colorado.

"So the pilot also claims there is an underground lab?"

If an underground lab were bored into a mountain, or involved a labyrinthine tunnel system, its location may not be well known.

Don't worry, an underground lab is not required.

He paused, staring down at the brightly lit open core of the underground lab.

We believe there is some kind of entrance somewhere in the population center structures that leads to the underground lab back here.

Onot turned around and walked back to the door of the underground lab.