Yes! i would own a XXI and make it my home!
I would have to make changes to the boat like more modern inside and its setup so she can be controled by just 1 to 3 ppl max therefore everything would be push button computerised. I would have a living room, TV, computer, booze bar, bedrooms, all the latest electronic gadgets needed to survive the command room would be the same for driving the boat, she would go deeper and stay longer submerged. I then would just cruise around the country going from one port to the next. Or maybe now and then head out to the pacific or atlantic and just get lost in the deep blue sea.
Dreams are free...