EMERGENCY ENVIRONMENTAL SYSTEMS

	The basic design philosophy of the Enterprise environmental support 
systems is for extreme reliability coupled with multiple redundancy. 
Nevertheless, Starfleet recognizes the unknown hazards to which starships 
and their crews are often exposed, and has provided yet another layer of 
preparedness for potential environmental crisis situations.

	The purpose of these emergency environmental support systems is to 
provide suitable life support for the crew for periods of time sufficient for the 
Engineering staff to restore normal function to either primary system or to 
the reserve system. The first element of this is an emergency backup system 
designed to provide shipwide lighting and atmospheric supply for 
approximately thirty minutes. This is intended to allow an orderly evacuation 
of all shipÕs personnel to emergency support shelters. These shelters are the 
second element of the emergency environmental support system.

CONTINGENCY ATMOSPHERIC AND POWER SUPPLY

	Supplementing the two redundant primary atmospheric support 
systems and reserve backup system is the contingency atmospheric and 
power supply system. This system consists of 425 self-contained air supply 
and power modules located throughout the ship at many corridor junctions.

	The principal element of these modules include ventilation fans, 
cryogenic oxygen storage, COÛ scrubbers, emergency lights, and batteries. 
In the event of a total failure of all primary and reserve systems, these units 
provide approximately thirty minutes of atmosphere and lighting throughout 
the ship, allowing all personnel to take sanctuary in designated 
environmental support shelters.

EMERGENCY SHELTERS

	In the event of major shipwide failure of environmental support, 
personnel can be instructed to report to one of fifty-two emergency shelter 
areas located throughout the habitable volume of the vehicle. Each 
designated shelter area is designed to sustain up to sixty-five crew members 
for up to thirty-six hours, assuming a minimum level of external support. 
These areas receive priority life support from a series of dedicated, 
protected utilities trunks so that they can remain habitable even in the event 
of major system outages elsewhere in the spacecraft.

	These shelters are also equipped with independent emergency 
breathing gas, water, food, and power supplies for up to twenty-four hours of 
operation, even with no support from other shipÕs systems. Emergency 
shelters are also equipped with at least two emergency pressure garment 
(EPG) environment suits, allowing crew personnel to travel through the 
unprotected portions of the vehicle for possible repair or rescue operations.

OTHER SCENARIOS

	A lesser environmental support failure may result in one or more 
areas being rendered uninhabitable. In such cases, the Commanding Officer 
may opt to evacuate the affected areas in order to protect crew personnel or 
to conserve life support capacity. Another option in the event of anticipated 
environmental systems failure is to evacuate personnel to shelter areas to 
minimize risk in the event that switchover to emergency backups is 
necessary.

	A more severe failure could force the evacuation of either the entire 
Saucer Module or Stardrive Section, with the crew taking refuge in the 
unaffected section. In such cases, environmental engineering personnel 
could remain in the damaged section to attempt repairs.  Æ