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Caves breathe. As the outside pressure increases or decreases the air inside a cave has to equalize. The most common cause is a pressure change is when the the outside temp changes due to the sun rising or setting. A front will also affect this. The larger the cave, the more air will go in & out. The air will feel like a wind. This is more noticeable ...


When you say "trapped" I presume you mean he cannot find his way out, as opposed to being trapped by rock fall or something blocking his exit such as flooding? The only weather-related clues could be when reaching to very near an entrance where the temperature can change. Caves tend to be at a fairly constant temperature (around the average for the location)...

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