Yeah, so instead of sending down divers with equipment you’re hauling hundreds of tons of concrete out of the sea, which means aside from a ship and crew which you’d need anyway you’re still going to need specialized equipment (some big honkin’ chains and winches at a minimum) and tools and such, and that stuff isn’t cheap either.
You need specialized equipment also if you send down people to do the job that deep. And given you need to use many more specialized people (not everyone can work at these depths and they are not cheap) with all the associated support infrastructures like decompression chanbers and so on. I doubt that the cost will be lower that simply hauling the whole thing out of water.
My point is that whether you send down divers or haul 400+ tons of concrete and equipment up from the bottom of the ocean, it’s going to be expensive to maintain either way, especially if things don’t go according to plan and they have to perform maintenance more than once every 20 years or whatever.
You need specialized equipment also if you send down people to do the job that deep. And given you need to use many more specialized people (not everyone can work at these depths and they are not cheap) with all the associated support infrastructures like decompression chanbers and so on. I doubt that the cost will be lower that simply hauling the whole thing out of water.
My point is that whether you send down divers or haul 400+ tons of concrete and equipment up from the bottom of the ocean, it’s going to be expensive to maintain either way, especially if things don’t go according to plan and they have to perform maintenance more than once every 20 years or whatever.