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Nautilus, the world's largest, most luxurious semi-submarine, will give you unobstructed views of the marine world as you travel in dry, air-conditioned comfort and your experienced marine guide narrates the trip. Visit Cheeseburger Reef where a diver will hand feed the fish and watch the vibrant colors of brilliant living coral come to life. Afterwards, spend some time in beautiful Georgetown for shopping or return to your ship.