 Meanwhile, from Algeciras in neutral Spain, an Italian expert on underwater operations, Antonio Tomolino (Foà), is secretly watching the British base in Gibraltar and planning new attacks.After the Italians mount a failed attack upon a cruiser in Gibraltar, Crabb and his divers recover one of the manned torpedoes and begin to repair it, with the new somewhat stringent Petty Officer Thorpe (James) coming in to take over physical and diving training.After a further series of attacks against ships in Gibraltar harbour and an attempt to recover secret documents from a wrecked aircraft, Crabb decides to visit Algeciras to discover where the Italians are operating from.