Location from Invincible by Robert Kirkman
The GDA's supervillain prison — buried beneath the Pentagon, where Cecil keeps the threats he can't kill and the assets he might need later.
The Block is Cecil's toolbox and his garbage disposal. Some inmates are genuinely too dangerous to release. Others are being stored until Cecil needs them — like D.A. Sinclair was stored until the Reaniman program proved useful. The line between prisoner and future employee is uncomfortably thin in the GDA's world.
A subterranean detention facility beneath the Pentagon complex. Reinforced containment cells designed for specific power sets — energy-dampening for energy projectors, strength-rated for super-strong prisoners, sensory-deprivation for telepaths. Sterile, institutional, and deeply unsettling.
Also known as: The Block, GDA Prison