00:00watch closely this is how bridges are built underwater abroad they don't dive down and
00:04build piece by piece instead a cofferdam ring is first erected in the middle of the water every
00:08drop inside pumped out turning the construction zone into temporary dry land concrete foundation
00:13is then poured pipes and rebar cages placed inside concrete continues pouring upward section by
00:17section at this point it's no different from building a bridge on land the pier slowly grows
00:22up from the water surface supporting concrete matching the exact pier thickness is then poured
00:26on both sides keeping heights consistent and making the entire structure bare load more evenly
00:30once concrete fully cures workers erect iron frames on both sides and weld them fixed
00:34another concrete layer poured for overall connection finally asphalt laid across the bridge deck a
00:39beautiful solid bridge is complete many people assume underwater bridge construction requires
00:43working in water the truly smart approach is driving the water away first then completing
00:47everything to the same standard as land construction not only is the process safer the bridge quality is
00:52far more reliable
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