At more than 150 feet above sea level, the Ultimate Abyss on Oasis Class ships is the tallest slide at sea. Thrill seekers begin their adventure at the slide's glass platform and then launch down 10 stories of twist and turns, whizzing past multisensory effects before blasting onto the Boardwalk.

The Ultimate Abyss slide, featured on Royal Caribbean’s Oasis-class ships (like Wonder of the Seas and Utopia of the Seas in 2026), is roughly 150 feet (45 meters) above sea level at its starting point. It is technically a 10-story drop, making it the tallest slide at sea that does not involve water. As a "dry slide," you ride on a specialized mat through a stainless steel tube filled with LED lights and sound effects. The slide drops you from Deck 16 all the way down to the Boardwalk on Deck 6. A supportive peer detail: the actual "vertical drop" is significant, but because the slide is a "corkscrew" design, you aren't falling straight down; you are spiraling at speeds of about 9 mph. In 2026, it remains one of the most popular "daredevil" activities on a cruise ship, providing a 13-second adrenaline rush that offers a unique bird's-eye view of the ship's aft before you vanish into the dark, echoing tunnels of the abyss.