 From 1943 until 1944 Charles William Beattie, a Royal Navy Signals specialist, also served on board "Casabianca" to safeguard and interpret secret cyphers sent to the boat whilst out on station.He took part in many of the secret landings on the Corsican coast.In her last mission, "Casabianca" landed 109 special forces men, a record for a submarine of her size.