Table 8.1. Shelter options
		Cost	No. of
No.	Option	per space	potential	Advantages	Disadvantages
		($)	spaces
			(million)
0	Do nothing	0	--	No cost	Vulnerable to nu-
					clear blackmail;
					very high
					casualties
1	"Best available"	1	240	Very low cost	High casualties
	shelter
2	Crisis upgrading	1-20	240	Very low cost	Requires 1-week
				before crisis,	warning; use of
				low cost during	private property;
				crisis	possible cleanup
					cost; some evac-
					uation required
3	Expedient	1-20	240	Very low cost	One-week warning
	shelter			for planning;	required; some
				low cost during	evacuation re-
				crisis; good	quired; short
				protection	life of shelter
4	Fallout shelter	0-20	240	Low cost	No help for risk
	in new con-				area; requires
	struction				legislation; may
					require evacua-
					tion; long de-
					ployment time
5	Mines (modify	10-100	40-100	Moderate cost;	Not applicable
	quarrying			good protection	to all cities;
	near cities				2- to 15-year de-
					ployment time
6	Earth-sheltered	60-300	160	Moderate cost;	Requires legis-
	structures			2-yr deployment	lation, home-
					sharing, blast
					Upgrading
7	Dual-use base-	250-750	240	Cost at low end	Rubble & fire in
	ment in new				central cities;