Related Rule
Practice Relating to Rule 107. Spies
Section A. Definition of spies
The Hellenic Navy’s International Law Manual (1995) provides: “A person acting undercover in the war zone or under false pretences with a view to obtain information for imparting it to the enemy is considered a spy.” 
Greece, International Law Manual, Hellenic Navy General Staff, Directorate A2, Division IV, 1995, Chapter 5, § 6.