ACKNOWLEDGEMENTS 



My sincerest appreciation is extended to CAPT Edward Clausner, Jr., 

 USN (Ret.), formerly of the Navy Material Command, who found the 

 time to listen to my pleas for support and, subsequently, provided the 

 resources to fund this effort. He reviewed several of its chapters, 

 opened many doors to information and, finally, still manages a smile 

 after one and one-half years of near-continual pestering. 



Secondly, my thanks and appreciation are tendered to CAPT Jack 

 Boiler, USN (Ret.), now Executive Secretary of the Marine Board of 

 the National Academy of Engineering. CAPT Boiler's support and 

 advice were instrumental in seeing this work reach fruition. 



I am indebted to Rear Admiral J. Edward Snyder, Jr., USN, Oceanog- 

 rapher of the Navy. His kindness and hospitality in providing me with 

 working space and office facilities, during my tenure with CAPT 

 Clausner, was boundless. I am further indebted to Admiral Snyder for 

 allowing me to use the name of his office in the many requests to 

 private and government institutions for information. 



Although he was not directly involved with the preparation or 

 funding of this work, Mr. John Perry, President and founder of Perry 

 Submarine Builders, has contributed to its content since 1965. Through 

 his gracious hospitality, the Perry staff, their submersibles and shops, 

 have been my practical primer for almost a decade. In the course of 

 this education, Mr. ,Perry kindly and indulgently stood by while I 

 stumbled through the frustrating process of finding out what wouldn't 

 work underwater and managed to keep a straight face while I attached 

 the latest in undersea navigation devices: A bicycle wheel, to his PC- 

 SB. In the course of such neophyte shenanigans, Mr. Perry has 

 persevered through some difficult times to place manned submersibles 

 in the category of practical and useful "work" boats, rather than 

 expensive engineering toys. 



Some 4,000 miles to the northwest of the Perry shops is the firm of 

 International Hydrodynamics Ltd. (HYCO), founded by three commer- 

 cial divers. Mack Thompson, Al Trice and Don Sorte, of Vancouver, B.C. 

 Likewise, these three opened their shops and files to me and provided 

 any and all information on their PISCES class submersible. In particu- 

 lar, I would like to express my appreciation to Mack Thompson, a 

 practical, imaginative, ingenious, submersible designer and manufac- 

 turer who responded to every request of mine and made the time 

 available for me to participate in dives on the PISCES III. The 

 hospitality of the HYCO staff made every visit to Canada a rewarding 

 and memorable occasion. 



Now, my reviewers, E. W. Seabrook Hull, as my editor, reviewed this 

 manuscript and restructured the narration to the English language 

 and the reasoning to that of a relative sanity. Mr. Lloyd Wilson of the 

 Naval Oceanographic Office took on the laborious chore of reviewing 

 the first proof print. With patience and skill he corrected the hundreds 

 of inconsistencies and spelling errors while imposing a sense of disci- 

 pline to an exceptionally rambling narration. The following people 

 kindly and most thoroughly reviewed individual chapters for technical 

 accuracy: CAPT R. K. R. Worthington, USN, (Ret.), the DEEP QUEST 



