Maybe you mean like bridges and stuff where pillars go deep and you’re like how tf did they build it underwater?
Caseons.. think of a giant pillar with thick walls they lower into the water and stack a few til it reaches the surface. They then can take a pump and pull out all the seawater from the inside and boom.. now they have dry land they can build the actual piles and cap them (the support poles)
So Caseons are the big reason we can do this type of thing. Sorry if that’s not what you were asking, I just noticed the other two answers focused on oil rigs.. which tend to float.
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