M*A*S*H season 7 episode 20
Episode title: C*A*V*E
The 4077th evacuation to a nearby cave to, avoid U.S. artillery fire on a Chinese target, poses problems for Hawkeye, who has a claustrophobia problem that Colonel Potter is unaware of. On the other hand, Margaret hates loud noises. And then there's the problem of a seriously wounded soldier...