A massive makeover of Royal Caribbean's Navigator of the Seas earlier this year cost a 'mere' $115 million. That's $35 million less than what Carnival spent on Sunrise. Royal Caribbean's just-announced makeover of Oasis of the Seas, billed as its biggest ship overhaul ever, is expected to cost $165 million. Carnival has never spent so much overhauling an older vessel, and we can't think of any other line that has, either.
