[yefragetuwrabrumuy]

Lots of cool pictures from Russian Fort Zverev that show what happens with thermobaric weapons in caves. It was hot enough to melt the red brick in the ceiling, which then formed icicles.

http://vacationorholiday.blogspot.com/2010/06/napalm-cave-in-russia-icicles-of-red.html

[Rebelbase]

But it’s a dry heat.