H I Sutton shared independent defence analysis on unconventional naval warfare. Focus topics include submarines, uncrewed platforms (AUVs, USVs), seabed warfare, special forces underwater vehicles and so-called “narco submarines”. To do this he combines the latest Open Source Intelligence (OSINT) with the traditional art and science of defense analysis. He occasionally writes non-fiction books on these topics and draws analysis-based illustrations to bring the subject to life. His personal website about these topics is Covert Shores (www.hisutton.com)