The Tankers would be really amazing to dive through. Lots of large compartments like 6 Stores, Main Magazines, the Fwd and Aft House, Bridge, Ras Deck and Uppers. Better than a warship as the size of things are I would think more dive friendly and safe.
Who knows where PRO will end up, but I fear from what I'm reading it will be sooner than was planned in the grand scheme of things. IMHO, if they have any dollar and cents sense, that is.