eli5: Why do cars seem to float in shallow water, but sink in deep water?

Question

eli5: Why do cars seem to float in shallow water, but sink in deep water?

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Answer 1

Cars aren’t water tight. When a car gets submerged, it will float because it’s full of air. As air escapes and water seeps in, the car will start to sink because it loses buoyancy. Its like helium leaking out of a baloon.