airplane pressure

Tsuchimikado stopped speaking and stared at Kamijou’s face.
“Kami-yan, are you even listening?”
“Ugh-ugh-ugh-ugh-ugh-ugh-ugh-ugh-ugh-ugh-ughh-ughhh-ughhhh!!”
Kamijou could not respond.
7,000 kph. The powerful g-forces created by such a speed were crushing Kamijou
Touma’s internal organs, leaving him unable to respond properly. It felt as if there were
a basketball being pushed up against his stomach while someone stomped on it as hard
as he or she could.

By being perfectly fine in that circumstance, Tsuchimikado was the strange one.

- Toaru Majutsu no Index Volume 14, Chapter 3 Part 2