| 摘要 |
Disclosed is a structure having an outer shell and an interior, designed for preventing forced entry and providing protection from ballistic projectiles for the occupants, wherein the outer shell includes an outer layer formed of a metal or metal alloys, an intermediate layer formed of a relatively low-density material which aids in slowing incoming ballistic projectiles and absorbing their energy, and an inner layer of lower density than the outer layer but greater density than the intermediate layer, wherein the inner layer has elasticity and is designed to deform upon impact with a ballistic projectile. The structure may include other features, such as additional doors and exterior conduits to admit ducting, wiring or water tubing.
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