undersea cable seem to be the best way to connect to the world with high speed and stable connection, but would that work if the city is not anchored to the seabed? satellite might be a better option although speed and stability might not be as good.
According to this page you are looking at around $50k per km of laid cable, regardless of capacity.
The CIOS cable, which links Cyprus and Israel, is described at the above linked site as being 261km long with a 622Mbps capacity. Was completed in late 1993 for a cost of $10M. That is WAY expensive but I guess not huge in the grand scheme of things.
Satellite definitely seems like the best plan for data, but may be tricky to obtain at the moment. The big provider in satellite internet is WildBlue, and they have two satellites – WildBlue-1 and Telesat Anik-F2. They don’t offer coverage to the ocean at all, so you could only connect just off the coast.. And assuming you can get a signal, their most expensive package is only 1.5mbps down and 256kbps up.
The two satellites have line-of-sight to most of the Pacific Ocean and half of the Atlantic, but they use spot-beams, which are all focused on the United States. It’s unlikely the market for internet service to the ocean would be large enough for them to reconfigure their satellites.
What do boats at sea currently do for internet access? I know there’s satphone service to almost everywhere on the ocean, can you run internet over those connections? and how fast is it?
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