ELI5; how are bridges so secure in the ocean?

Question

I understand they pour concrete and use large bolts but how are they able to ensure the bridge remains stable? The ocean floor doesn’t seem too predictable so I’m curious how they confidently do this.

In: 1

Answer 1

Ocean floor is the same as regular ground. Theres just water on it. Pump out the water, hit rock, you got good ground