[So it's gonna be one of those days. Flynn sighs.] Vents.

[He pauses, reaching out to rap his knuckles against the drywall, turning in a small half-circle.] Could be space behind the walls, too. That would explain why we both heard it out of our respective directions. Might allow it to move around more freely and quickly.

[Might also mean "it" is a lot bigger than something that fits into vents, so Flynn's not too fond of his theory here.]

Well. At least we won't die of radiation sickness.