On August 14, 2015, the film was released for the first time on the day of the Disney fan meeting D23. On November 10, the first poster and trailer were released. On November 17, the film released a dynamic poster. On December 31, the film released a concept map, and the characters Bailey the Beluga and Destiny the Whale Shark made their debut.
On January 27, 2016, the film released a leading trailer. On March 3, the movie was released with a trailer, and the characters such as octopus and sea urchin appeared. On May 25th, the film was released with a trailer and more characters appeared. On May 27th, the film crew released a Chinese version of the trailer specially tailored for Chinese audiences. On May 30, the film party released a Chinese movie poster and a Chinese version of the dubbing lineup. On June 6, the film crew released a Chinese version of the Dream Promo. On June 9, the film premiered in Los Angeles.
