"The Phase 2 datacenter can house 27.6 petabytes of data."

Assuming you're using 15TB as one LoC unit, then about 1,800 LoCs.

They did a mini-version in the US a few years ago, this one is 4x the size and 100x the compute

It's a fail-in-place data center. If a hard disk fails, you don't do anything. They used to replace telephony equipment all the time too, now it's just a locked room in a building. This is pushing data centers to be more hands-off.

So they don’t do anything? Eventually you’re just maintaining stacks of errored and broken computers.

By then you've replaced the datacenter and you can shift the workload and then salvage it.

In theory you'd only leave it down there for three years anyway before everything in it is worth zero, at least to the IRS.

Yeah. Fail in place over the service lifetime. When enough stuff is failed that it isn't worth keeping down there, you pull it up and refill it.

Based on the picture, "pulling it up" looks like a fairly intensive task, requiring boats, persons, etc.

That kind of thing eats directly into the ROI for a datacenter. I doubt it competes with a static building with a bunch of solar panels on top.

Might just fail-in-place, then. Although that looks pretty bad from an environmentalist perspective.

Putting in on/in a boat or near the coast might get you the seawater for cooling, but the project lists a few other big benefits like oxygen-free atmosphere, constant temperatures year-round, and ease of deployment.

A hermetically sealed capsule can be placed on a boat just as easily as a submarine, if not easier due to the pressure difference.

I'll give you the constant temperature but this project is about using the nearly-free ocean to maintain temperature so surely the delta isn't too large here.

I don't see how this is easier than a boat at anchor.