Pretty scary looking,huh? The Ultimate Abyss on Royal Caribbean’s Harmony of the Seas ismore than 150 feet above sea level! It offers side-by-side slides that send guests whooshing down and around at a rate of 9 miles per hour. Yikes! Guests launch from a glass platform on deck 16 and have time for a quick prayer and one last look at the Boardwalk 10 decks below before climbing onto a mat and taking the plunge down to deck 6! There’s LED lights and graffiti artwork designed to create a starry night and spontaneous audio effects within each tunnel that create a multi-sensory thrill for daring guests. I can tell you now, I am not a daring guest!