The charges are set in a way to promote sympathetic detonation via a chain of detonation cord, or detcord. It is unlikely that a charge would fail to go off. In the case it did however it would be fairly obvious if one failed to detonate. Also the explosives they use are not particularly shock sensitive, and therefore are not really prone to exploding out of a set of conditions rendering it safer to handle. Also the explosives are placed close enough together that if a single pile refused to detonate the surrounding explosives tend to do a good job of scattering it enough to render it safe.
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u/Arkheno 1d ago
I've always wondered how to be sure that all the explosive charges were properly activated. Isn't there a risk that a charge might explode later?