A volcano starts rumbling, and suddenly erupts. But instead of seeing lava trickling down, you see a massive cloud of ash quickly coming towards you. This isn't just any regular volcano explosion. Instead, it's a pyroclastic flow. It can wipe out entire cities in minutes, killing thousands of people. And now, one's coming for you.

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Whether it’s an earthquake, mudslide or shark attack, survive whatever awaits you. How To Survive shows how to endure life-threatening moments with science and survivor stories.

Note: This video is not intended to be a substitute for professional advice, diagnosis, or treatment. Always seek the advice of your physician or another qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay in seeking it because of something you have seen on this channel. If you think you may have an emergency, call your doctor, the ambulance or the police immediately. Underknown does not recommend or endorse any specific tests, physicians, products, procedures, opinions, or other information that may be mentioned in this video. Reliance on any information provided by Underknown is solely at your own risk.

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