The "Voyager"-class "Navigator of the Seas" and the "Radiance"-class "Brilliance of the Seas" were put into service in 2002. "Mariner of the Seas" and "Serenade of the Seas", another pair of "Voyager" and "Radiance"-class ships, were introduced the next year, and rock-climbing walls were made a feature of every Royal Caribbean ship that year. A fourth "Radiance"-class ship, "Jewel of the Seas", followed in 2004, and the line's "Nordic Empress" was reconditioned and re-christened as "Empress of the Seas", which was later sold to "Pullmantur Cruises" in 2008. In 2005, "Enchantment of the Seas" underwent a massive renovation including enlarging the ship with a midsection.