Blue and Gold. They swap crews at regular intervals. My guess, and it’s just a guess since i didn’t bother to read the whole thing, is that the 700+ day deployment refers to the boat only.
Still-a 700 day deployment even for a piece of equipment seems excessive to me. I personally don’t understand how a vessel like that could go that long without dockyard work. I understand that there are huge backlogs for sub maintenance, so perhaps it is either let them sit tied up to a dock, or steam them.
But I freely admit I don’t know what the dockyard schedules or work requests look like for submarines.