invulnerable
air-raid shelter
bomb shelter
shellproof
chamber
proof
aerostat
brick-and-stone
bullet-proof
chancellery
coin-op
cold-storage
corrugated-iron
deep-freeze
deflective
filled-up
fireproof
first-base
grav
ground-level
ill-reputed
isma
line of battle
long-closed
marines'
moderate-sized
multi-hued
nurses'
palatial
pressure-suit
prison-like
psycho-therapeutic
ready-service
restored
safe-deposit
safety-deposit
snow-bound
subbasement
vacuum-sealed
white-fringed