Octonauts and the Caves of Sac Actun The Octonauts Are Back. The Octonauts embark on an underwater adventure, navigating a set of challenging caves to help a small octopus friend return to the Caribbean Sea. Details Casts Galleries Posters Title Octonauts and the Caves of Sac Actun Release Date 2020-08-14 Runtime 01 Hours 12 Minutes Genres Family Animation Production Companies Silvergate Media, Mainframe Studios Production Countries United Kingdom Simon Greenall... Captain Barnacles (Voice)... Paul Panting... Peso (Voice)... Jo Wyatt... Tweak (Voice)... Keith Wickham... Shellington/Inkling (Voic... Michael C. Murphy... Turnip (Voice)... Teresa Gallagher... Dashi/Ryla (Voice)... Rob Rackstraw... Kwazii (Voice)... Original Size (2048x1152) Original Size (1280x720) Original Size (3840x2160) Original Size (1240x1858) Original Size (1500x2137) Original Size (736x1000)