While Xuli and Lars help some local divers explore the underwater ruins of Port Royal, Jamaica, Glitch sets off in search of treasure buried by his great-great-great-uncle, Captain Grimbeard. But his efforts cause silt to churn up from the seabed, trapping Lars under the water. Will Xuli manage to get him free before his air runs out?

Originally released by BBC Worldwide Learning, 2020. Streaming video file encoded with permission for digital streaming by Infobase on January 18, 2022.