Enemies can launch ground-penetrating missiles to obliterate your Hideouts. These behave like base attack craft. Each unintercepted missile swarm inflicts a number of hits indicated by its signature (eg. t.3 = 3 hits). The power rating of the swarm also influences its durability.
Each hit destroys one building, although large buildings can be hit more than once. Buildings are more or less likely to be hit based on their Missile Attraction attribute (see ANAL). Missile swarms are indicated on radar by a target reticule symbol.