An Aquaman spinoff film centered on the Trench, the mass of ravenous amphibious creatures who attack Aquaman and Mera partway through the original film, is reportedly in early development.
Per The Hollywood Reporter, the project is simply titled The Trench, and won’t involve any of the main cast from the original film. It’s reportedly being written by newcomers Noah Gardner and Aidan Fitzgerald, and will be “horror-tinged” and set in the kingdom of the Trench. Both writers were assistants at JJ Abrams’ Bad Robot Productions, and reportedly wrote the script for a submarine thriller called The Volos.
Source: IGN.com Aquaman Spinoff Movie About The Trench in Development