As of 2026, the Oasis-class ships from Royal Caribbean are the primary vessels famous for having a zipline at sea. This includes iconic ships like the Oasis of the Seas, Allure of the Seas, Harmony of the Seas, Symphony of the Seas, Wonder of the Seas, and the Utopia of the Seas. The zipline on these ships is a "gold standard" thrill, stretching 82 feet across the open-air Boardwalk neighborhood, suspended nine decks above the ground. It offers a breathtaking (and heart-pounding) view of the AquaTheater and the ship's stern as you glide across the center of the vessel. While some other lines have experimented with "Rope Courses" (like Carnival and Norwegian), Royal Caribbean remains the only major line with a traditional high-speed zipline integrated into the ship's architecture. To ride, you typically need to sign a waiver and wear closed-toe shoes; there is no extra charge for the experience, but it is one of the most popular activities, so it is wise to head there early during a "sea day" to avoid the longest queues.