The NATO Undersea Research Centre (NURC) is hosting a serious gaming event, called the Harbor Protection Table-Top Exercise (HPT2E), which aims to significantly advance interoperability and capabilities in maritime security. Sponsored by NATO’s Emerging Security Challenges Division Defense Against Terrorism program of work, the exercise, held 20-23 March at La Spezia, Italy, focuses on the protection of military forces, shipments, and critical civilian infrastructure in ports and harbors during times of high threat alert.