H.I. Sutton writes about the under-reported submarines, seeking out unusual and interesting vessels and technologies involved in fighting beneath the waves: submarines, capabilities, naval special forces underwater vehicles and the changing world of underwater warfare and seabed warfare. 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.