In other words
they'll never actually know
(0800221155 Coldseal windows, Sat 9 Jul 2005, 22:06, archived)

no they'll know
the remote detonations are designed to destroy the device's mechanism but not necessarily to the extent that the device itself is blown to smithereens
(Mehitabel_Itrang, Sat 9 Jul 2005, 22:13, archived)