Neri moves the Synchronium piece to her secret underwater cave to keep it safe. Benny's father chastises him for spending time with Brett and Cass instead of studying. Cass finds a young boy on ORCA who swam to ORCA from the ship that was taking him and his family home after they were refused refugee status, she keeps him a secret and brings him food. Brett and Benny go in search of sunken treasure but when a valuable piece of equipment falls overboard, Benny goes after it and runs out of oxygen. Charlie calls Neri to rescue him revealing to him her presence. Benny lies to the commander about the incident to keep Neri a secret. Cass' stowaway is discovered and he is turned over to immigration officials. Lena gains access to her father's files about Neri.