How is a bridge build at sea?#highspeedrail #amazingconstruction

Added: 2026-05-27

[00:00:00][music] >> How do engineers actually build bridge piers underwater for sea bridges?

[00:00:06]How do engineers build huge bridge piers in deep sea? China uses [music] a brilliant sink box method.

[00:00:13]They sink a massive hollow concrete cylinder to the seabed.

[00:00:18]Then they drain [music] all the water from the inside.

[00:00:22]After that, they build the bridge [music] pier within the cylinder.

[00:00:26]The method looks simple, but it's extremely smart. This is the reason why [music] Chinese bridges can stand strong for hundreds of years. Join us and subscribe for more incredible engineering marvels.