Air Locked

“Their conversation was air locked — words trapped behind unspoken tension.”

Feeling stuck or unable to express something. air locked

Suddenly, the ship's intercom crackled to life. "Bridge, this is Engineering. We've got a problem down here. The airlock's malfunctioned, and we can't equalize the pressure." “Their conversation was air locked — words trapped

"Understood, Chief," Sarah interrupted. "Get me a damage report and a plan to fix it, pronto." a medical emergency

Since "Air Locked" can refer to a few different concepts depending on the context (a sci-fi scenario, a medical emergency, or packaging), I have provided content for the three most likely interpretations.