Think cruises are a snooze? You’ve never ridden Royal Caribbean’s 10-story tubular slide. Billed as the “tallest slide at sea,” the Ultimate Abyss takes thrillseekers on a 13-second, LED-lit ride with a 420-degree corkscrew and 360-degree turns. Free aboard the Harmony of the Seas, Symphony of the Seas, and Oasis of the Seas.
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