Sometimes, as with mines, you don't necessarily want them to go off. You only want them to go off if triggered. They would remain dangerous, however, unless th

Sometimes, as with mines, you don't necessarily want them to go off. You only want them to go off if triggered. They would remain dangerous, however, unless they're the kind that renders itself chemically inert or otherwise incapable of exploding after some period of time has passed, in order to reduce risk of civilian casualties.