00:00A 100-foot megatsunami could slam into the U.S. West Coast,
00:04and scientists say it's not a matter of if, but when.
00:07It all starts deep below the surface at the Cascadia subduction zone,
00:12a massive 700-mile fault stretching from northern California to British Columbia.
00:17It's been eerily silent for 300 years, and that's exactly why experts are worried.
00:22They predict a devastating earthquake, as powerful as magnitude 9.0,
00:27could strike at any moment.
00:29And when it does, a monstrous wall of water could follow,
00:32wiping out entire towns, killing thousands, and reshaping the coastline for centuries.
00:38Here's the chilling part. Rising sea levels are only making it worse.
00:42If the quake strikes closer to 2100, the flooding could triple,
00:46reaching deeper inland and putting even more people at risk.
00:49Strangely, some scientists say the sooner this happens, the better,
00:53because every year we wait, the danger grows.
00:56With a 37% chance of this hitting within 50 years,
00:59cities along California, Oregon, and Washington need to prepare, now,
01:04because when this doomsday wave comes, there may be no time to escape.
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