camouflet
noun
ca·mou·flet
¦kamə¦flā
plural -s
1
: a mine so charged and placed that its detonation will destroy enemy mining tunnels
2
a
: an underground or subsurface explosion of a bomb or shell that leaves a sealed pocket of smoke and gas
b
: a pocket formed in this way
Word History
Etymology
French, literally, smoke blown into a sleeper's face from lighted paper