It’s all relative.
The number one threat to Internet in your area = a construction worker with a backhoe. Cables buried underground in a city are much more likely to be damaged than undersea cables. There is much more digging going on.
While the ocean is very deep in a few places, they don’t run cables there. The ocean, below a couple of km in depth, is amazingly free of backhoes, life, and digging in general. A cable can just lie there undisturbed, sending along Internet.
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