X.1: The Royal Navy's Mystery Submarine
"X.1: The Royal Navy's Mystery Submarinewill be of great interest to readers who are submariners, naval enthusiasts, or historians of military technology. It describes a lost era: before advances in radar and sonar made the life of the submariner more precarious; before the snorkel acoustic quieting and ultimately, nuclear propulsion, turned submersible boats into true submarines. It offers a unique glimpse into an unhappy period of the Royal Navy's epic history."--DefenseMediaNetwork.com