the fourth ship would be Spectrum of the Seas. It can accommodate 4,246 guests at double occupancy and 1,551 international crew members. On 3 November 2015, Royal Caribbean entered into an agreement with Meyer Werft for a fifth Quantum-class ship, also a Quantum Ultra-class ship and the sister ship to the first Quantum Ultra-class ship. Scheduled to be delivered in April 2021, it was given the name, Odyssey of the Seas, on 1 February 2019. She is the first Quantum-class ship to be homeported in South Florida, at Port Everglades. Design The Quantum class represented a different direction for Royal Caribbean. The and designs evolved into the , which was considered the pinnacle in terms of scale and facilities. By contrast, the Quantum-class lineage is closer to that of the , which was designed for cruising in cooler climates. The Quantum class is smaller than the preceding Oasis class, just as the Radiance class is smaller than the preceding Voyager class. Nonetheless, despite not being Royal Caribbean's largest class of ship, the Quantum class has pioneered several new innovations to the cruise line. Staterooms Quantum-class ships have 16 passenger-accessible decks, 8 of which feature balcony staterooms overlooking the ocean. All balcony staterooms above the lifeboats are recessed into the superstructure and do not look down directly at the ocean. There are a total of 2,090 staterooms: 1,570 balcony staterooms, 147 ocean-view staterooms, and 373 inside staterooms. Of those staterooms, 34 are wheelchair accessible and 28 are studio staterooms for single travelers (including 12 studio staterooms with balconies). All aft-facing staterooms are 2-story "loft" suites. All interior staterooms feature a floor-to-ceiling, 80-inch high-definition TV screen showing live views from the outside of the ship, which Royal Caribbean calls a "Virtual Balcony". On average, staterooms on the Quantum class are 9 percent larger than those on the preceding Oasis class. Features A new feature on the Quantum class is "RipCord by iFLY", a skydiving simulator set in a recirculating indoor recreational vertical wind tunnel. Another innovation on the Quantum class is the "North Star" observation tower, located at the forward end of the top deck. It uses a glass-walled capsule on the end of a crane arm to lift groups of up to 14 guests up and over the edge of the ship, reaching heights of up to above sea level. Royal Caribbean introduced the first escape room experience on a cruise