A massive, reinforced steel door designed for high-security access, featuring a circular shape with a diameter of approximately 3 meters. The surface is heavily textured with visible weld marks, rust patches, and battle scars, giving it a weathered and battle-hardened appearance. Central to the door is a large, mechanical locking mechanism with multiple rotating gears and bolts, painted in a muted olive green with faded warning signs and caution stripes.