Final answer:
You can suffocate even if your nose and mouth are free when buried under a collapsed trench.
Explanation:
Yes, you can suffocate even if your nose and mouth are free if a trench collapses and covers your body due to the weight of the soil compressing your chest and preventing the diaphragm from moving properly to inhale air. This situation can lead to suffocation even with the airway being unobstructed.
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