Octonauts & the Caves of Sac Actun

 is a British animated special set in the Octonauts continuity. It was directed by and stars Teresa Gallagher, Simon Greenall, and Michael Murphy. This movie, which is part of the Octonauts series, was released on Netflix on August 14, 2020.

Summary
"The Octonauts embark on an underwater adventure, navigating a set of challenging caves to help a small octopus friend return home to the Caribbean Sea."

- Official Netflix synopsis