Royal Caribbean International calls them 'The Perfect Storm.'
Plus, newly announced is The Abyss, a 10-story slide taking riders from high above the ship's AquaTheater to the Boardwalk neighborhood.
The slides are among the new features on this third Oasis-class ship, under construction at STX France and due to enter service next spring.
Harmony of the Seas will sail seven-night round-trips from Barcelona and Civitavecchia (Rome) before taking up its 2016/17 winter deployment from Florida's Port Everglades.