Unclassified 
Secunty Classification 
DOCUMENT CONTROL DATA-R&D 
(Security Classification of title, body of abstract and indexing annotation must be entered when the overall report ts classified) 
1! ORIGINATING ACTIVITY (Corporate author) 2a. REPORT SECURITY CLASSIFICATION | 
Naval Civil Engineering Laboratory Unclassified 
- - 26. GROUP 
a tala wee sees a maa ime =) 
3. REPORT TITLE 
CONCEPTS FOR DRILLING AND EXCAVATING IN AND BELOW THE OCEAN BOTTOM 
4. DESCRIPTIVE NOTES (Type of report and inclusive dates) 
Final; July 1968 to June 1969 
5. AUTHOR(S) (Firat name, middle initial, last name) 
E. J. Beck, T. L. Culbertson, P. J. Daly, H. A. Gaberson, and A. L. Scott. 
6. REPORT DATE 7a. TOTAL NO. OF PAGES 7b. NO. OF REFS 
May 1971 103 81 
8a. CONTRACT OR GRANT NO. 98. ORIGINATOR’S REPORT NUMBER(S) 
b. prosectno. YF 38.535.003.01.006 TR-725 
9b. OTHER REPORT NO(S) (Any other numbera that may be essigned 
this report) 
10. DISTRIBUTION STATEMENT 
Approved for public release; distribution unlimited. 
11. SUPPLEMENTARY NOTES 12. SPONSORING MILITARY ACTIVITY 
Naval Facilities Engineering Command 
Washington, D.C. 20390 
In support of planned development of construction systems for precise excavation 
and drilling in the deep ocean floor, a study of the potential problems which might be encountered 
has been made. Two Deep Ocean Technology (DOT) efforts are considered, and two major sub- 
systems are described. The first subsystem is a seafloor excavator which can shape the ocean floor, 
prepare trenches and drill shallow foundation holes. To avoid the problems of man in undersea 
environment, this equipment will be unmanned, and remotely controlled by computer and/or 
numerical techniques. The primary work function will be similar to a conventional milling 
machine, with similar ability to bore shallow holes. The second subsystem is for penetration of 
ocean bottom rock with large holes, sealing off the cavity with a prepared steel structure, dewa- 
tering, and lateral tunneling at one-atmosphere pressure. Initial penetration will be by equipment 
similar to large mining or tunneling moles, recent technology in rock disintegration may allow use 
of a less massive machine with low thrust and torque. 
DD rom 1473 ee) Unclassified 
S/N 0101-807-6801 Security Classification 
