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

unlike the ground, the ocean floor is EXTREMELY stable, because its being compressed by all the water over it.

Every 10.33 meters = 1 atmospheric pressure.