
Okay, but that excuse
is running out of STEAM.
The Big Bang Theory Season 12, Episode 22

...the STEAM tunnels below this access point
should be the closest analog to the mines.
The Big Bang Theory Season 8, Episode 6

(STEAM HISSING)
The Big Bang Theory Season 10, Episode 15

Better than I feel in their STEAM shower?
I don't think so.
The Big Bang Theory Season 10, Episode 18

Huh. I never knew there were
STEAM tunnels down here.
The Big Bang Theory Season 8, Episode 6