Not quite ... explosives do not need external oxygen
to work. An oxygen supplier and the stuff to be burned
are packed together in an inert way (e.g. gunpowder:
the nitrate supplies the oxygen, the coal and the
sulfur get burned).
As for the extinguish-fire-with-explosives trick:
every fire needs three conditions: burnable material
(here: oil), oxygen (here: surrounding air) and
heat (here: the flame). If you take one of these
three, the fire will cease. The explosives simply
blow away the flame and any heated material
Sorry if this sounds like a lecture, but fire's
been a special field of interest of mine. ;-)
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