M.I. High - Season 4 - Eps 13: The Octopus
The spies have a vital mission - they must protect a ship carrying the last component required to make a nuclear bomb. Other ships carrying nuclear parts have been raided by pirates and MI9 have intelligence to suggest that this ship will be targeted. The team use Frank's mini-submarine to follow the ship, in an undercover, underwater mission. Meanwhile, Frank is very worried about the team since his cousin Charlton went missing in the same waters some years back and was never found.
About M.I. High

Title: M.I. High
First Air Date: 2007-01-08
Last Air Date: 2014-03-31
Status: Ended
Rating: 6.2/10 (from 18 votes)
Language: EN
Seasons: 7
Total Episodes: 88
Network: BBC One
Genres: Action & Adventure, Crime, Drama, Family
Production Companies: Kudos
Synopsis
A team of undercover teenage spies working for the fictional British secret intelligence agency MI9 who have to balance their school life with their jobs as secret agents.
Cast

Pollyanna McIntosh
Crime Minster