00:00The Tokyo subway system faces millions of tons of violent tectonic force right now.
00:06How do multi-story underground concrete chambers survive ground shaking that easily snap solid steel pillars?
00:14Engineers once assumed rigid anchoring was safest, but rigid structures shatter instantly under massive seismic wave impacts.
00:22Massive lead and rubber sandwich pads flex horizontally, absorbing and deflecting the destructive shock waves completely underground.
00:30This elastic isolation keeps the entire subterranean transit network operating safely while the Tokyo subway system faces millions of tons
00:39of violent tectonic force right now.
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