Tomorrowland Announces 2018 Dates, Theme

Tomorrowland, 2016
Mauricio Santana/Getty Images

A general view of atmosphere with fireworks during the third day of the Tomorrowland music festival at Parque Maeda Itu on April 23, 2016 in Sao Paulo, Brazil. 

Come one, come all, to a land under the sea, where mystery awaits and great beats are on deck -- Tomorrowland has revealed its dates and theme for 2018.

Every year, the magical three-day event centers its huge, storybook stage productions around a theme. In 2017, it was "Amicorum Spectaculum," the carnival of friends. Now, in 2018, will be "The Story of Planaxis." A planaxis is a genus of small sea snails, the ones with swirly shells, hence the Fibonacci sequence logo, which, with that staff sticking through it also resembles the bottom half of a Treble clef. A cinematic trailer reveals Planaxis as an underwater city, a thriving Atlantis of magical proportion, which you can watch below.

Things will get hotter under the water when Tomorrowland returns to its beautiful home in Boom, Belgium, for another two weekends in 2018. Mark your calendar for Fridays through Sundays, July 20 to 22, and July 27 to 29. Check the website for more details.