In addition to routine maintenance and technical overhaul, the Explorer of the Seas received new waterslides during its recent stay at the Navantia shipyard. Named "The Perfect Storm," the pair of slides were added to the ship's 13th deck on an area previously occupied by sun loungers. The drydock work scope also included hotel upkeep, as well as minor upgrades and class work. As the second ship in Royal Caribbean International's Voyager Class, the Explorer of the Seas originally entered service in 2000. With capacity for 3,100 guests, the Explorer was also one of the first ships to offer the Royal Promenade, Royal Caribbean's trademark indoor boulevard surrounded by shops, bars, and restaurants. In 2015, the ship underwent a major refurbishment that added new features, such as the FlowRider surf simulator and a 3-D movie theater.