The crucial role of intelligence among the various royal navies of Europe during the 17th and the 18th centuries cannot be underestimated. Since naval warfare was a very powerful weapon during these centuries, as indeed it is today, it is no wonder that many naval architects, such as Deane and Chapman, as well as designers of various kinds, and even skilled workers were kept under surveillance by naval and military espionage. A historian of the 1800s remarked, " The design of the ships remained a jealously guarded secret until the great thirst for knowledge of the 1600s leveraged to open up the old era. The mystery was based on technical knowledge and practical experience." [[{"type":"media","view_mode":"media_large","fid":"104631","attributes":{"alt":"Diagram of a warship \"A SHIP
