Symphony of the Seas

(1 p.m. EDT) -- The world's biggest cruise ship is one step closer to its April 2018 debut.

Royal Caribbean's 5,497-passenger Symphony of the Seas, which will be the line's fourth Oasis-class ship, was floated out of dry dock for the first time today, at the STX shipyard in France. The ship will now undergo construction on its interior.

Symphony of the Seas will have 28 more cabins than its sister ship, Harmony of the Seas. It also will boast many of the same innovative attractions as its sister ships (including Oasis of the Seas and Allure of the Seas), such as the Bionic Bar, AquaTheater, and Central Park and Boardwalk "neighborhoods." Additionally, it will have the Perfect Storm trio of waterslides and the Ultimate Abyss, all of which can be found on Harmony of the Seas.

After it launches, Symphony of the Seas will spend its inaugural summer season in the Mediterranean. It will then reposition to Miami early November 2018, where it will sail one-week Eastern and Western Caribbean itineraries.

--By Dori Saltzman, Senior Editor