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Safeguard people and property against fire and related hazards in subterranean spaces with the 2010 NFPA 520.

NFPA 520: Standard on Subterranean Spaces covers subterranean spaces that are developed for public assembly, business, manufacturing or other uses which are unique environments and present many special fire and life safety considerations. This standard addresses critical safety issues in such underground areas including criteria for:

* Construction features
* Means of egress
* Fire alarm, detection, and suppression systems
* Emergency preparedness
* Fire department provisions