00:00Deep-sea concrete grows stronger when no one watches.
00:03Seriously.
00:05Ancient Roman harbors used concrete that fixes itself.
00:08It gets stronger over centuries.
00:11Ocean water sneaks in.
00:13It hits volcanic ash.
00:15New crystals grow.
00:16Welding cracks shut.
00:18Modern concrete only cracks and crumbles.
00:21This ancient stuff actually improves with age.
00:24This living rock keeps building itself.
00:27Discover more wild secrets at the link in bio.
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