confined explosion

And then there was a heavy, muffled thud within the monster's body, a confined explosion that shook the very ground.

During a test, one Exocomp refuses to enter a tunnel; moments later a confined explosion occurs within the tunnel.

In a confined explosion, where the explosive volume is small (such as occurs in the powder chamber of a firearm), practically all the heat of explosion is conserved as useful energy.

Large buildings of various structural types such as masonry, steel frame, or reinforced concrete may be reduced to an easily removed pile of rubble by selective destruction of supporting elements by sequenced and confined explosions.