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But I assume layering cable is not a one time cost right? There should be some operation cost involved? Such as maintenance?

I am still hoping sometime we could have massive amount of hollow fibre undersea cable to reduce latency between different continents.

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Operational costs (outside of repairing cuts) round to zero in comparison to the capital costs of laying the initial cable. There are OLD cables that are still active, despite relatively low bandwidth, because going and disconnecting everything on either end (even though the cable would remain there) is considered an additional unnecessary cost.

No, you don’t do maintenance on them. They are designed to be laid and forgotten.

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