The third season of The Deep was confirmed to be in production by DHX Media, A Stark Production, and Technicolor Animation after ABC ME (an Australian Broadcasting Company channel) ordered 13 episodes of Season 3. Season 3 is expected to have 13 half-hour episodes, totaling up to 52 episodes for the series, with the season to be premiered in Family CHRGD in Canada and on Netflix globally (except for Canada). Currently, Season 3 is expected to be released on January 2019.
On January 21, 2018, Tom Taylor hinted on Twitter that there will be news about a possible announcement of a 3rd season. The first news came on February 13, 2018 when DHX Media, A Stark Production, and Technicolor, announcing that Australia's ABC ME ordered an additional 13 half-hour episodes of The Deep animated series, giving Season 3 a green light; with Season 3 to premiere on Family CHRGD in Canada and with a Global release on Netflix.
On April 12, 2018, Tom Taylor announced that the script writing for the series was completed. "The Race" was also announced to be one of the titles for the for the episode, possibly the last episode of the season.
At Toy fair 2018 Steven Wendland from Technicolor announced a new line of toys for the show which includes action figures of the main characters, some of the creatures, stuffed animals, and a few of the vehicles including the Rover, White Knight, and Mag Knight, as well as a new vehicle called the "Red Claw" which Wendland describes as the pirates version of the Rover and is said to appear in season 3.