00:00Beneath the streets of Naples, a sleeping giant stirs.
00:03And if it wakes up, it could wipe out millions in moments.
00:07In southern Italy lies Campi Flegre, a supervolcano that hasn't erupted since 1538.
00:13But now it's rumbling back to life.
00:15People here live on shaky ground, literally.
00:18Manholes steam, windows rattle, and the earth breathes beneath their feet.
00:23The monster under Naples is restless.
00:26Researchers are alarmed by rising carbon dioxide levels in the air.
00:29That's a clear sign.
00:31Magma might be rising again.
00:33And the worst part?
00:34This isn't just magma.
00:36The pressure from hydrothermal fluids could blow first.
00:39Imagine a pressure cooker deep underground.
00:41Now imagine it cracking.
00:43Campi Flegre's caldera stretches 125 miles, right under homes, roads, and entire neighborhoods.
00:50If it erupts, experts say evacuations won't be enough.
00:53The people of Naples sleep above a beast.
00:56That's no longer silent.
00:58Just waiting.
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