How can one protect himself if trapped in a collapsed building ? 

Save yor energy and breathe 
Try to make your location known to the rescuers by tapping on a solid object

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ggkh
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whats it
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yeah!!!
 
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dzfj
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Cup his mouth and keep screaming 'HELPPP!!!'
Take shelter under something.
Try getting to the top and getting out of there.
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