The US Navy first provided a diving manual for training and operational guidance in 1905, and the first book titled Diving Manual was published in 1916. Since then books titled Diving Manual or U.S. Navy Diving Manual have been published several times, each one updating the content of the previous version. The amount of information provided has tended to increase over the years, the 1905 edition had approximately 66 pages, while Revision 7 (2016 updated with Change A, dated April 2018) has 992 pages in 18 chapters; the manuals are illustrated with contemporary photographs, diagrams and graphs.