WARNING: This hatch must not be sealed before all personnel have been admitted, or before all steps of safety procedure prescribed by Technical Manual CD-Bu-83A have been accomplished. When Hatch is sealed, air within shelter will be pressurized 2.0 p.s.i. above ambient barometric level to minimize inward diffusion. Once sealed, the hatch will be automatically unlocked by the servomonitor system when, but not before, any of the following conditions prevail: (1) when the exterior radiation count falls below the danger level, (2) when the air and water repurification system fails, (3) when the food supply is exhausted, (4) when the internal power supply fails. See CD-Bu-83A for further instructions.