This has always been a nagging question for awhile. How do they not collapse when being built? How can oil rigs stand as in how far deep do they go down in order to still stand? Underwater tunnels do they just dig on angle from a dry spot and go?
Any I’d also like to thank the admins for helping me out, I appreciate it. Especially sense I’m new to the group and reddit itself.
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Often they’re built on land and sunk in one piece, like a submarine with no propulsion.
Oil rigs are built out of multiple, or sometimes one massive, leg segments that get stacked on top of each other until they reach the surface. Not all of them are actually standing on the bottom though, many are actually floating platforms firmly chained to anchors on the seafloor.
The Channel Tunnel was dug by tunnel boring machines starting on the English and French coasts and meeting in the middle. There is tech being developed to construct underwater tunnels with concrete segments built on land and sunk into place, but tunnel boring is the primary method.
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