DEPARTMENT OF THE NAVY
OFFICE OF THE CHIEF OF NAVAL OPERATIONS
2000
NAVY PENTAGON
W
ASHINGTON DC 20350-2000
OPNAVINST 9110.1D
N97
15 Nov 2017
OPNAV INSTRUCTION 9110.1D
From: Chief of Naval Operations
Subj: SUBMARINE TEST AND OPERATING DEPTHS
1. Purpose. To implement policy concerning submarine test and maximum operating depths,
the conduct of test and deep dives by submarines, and use of escorts. This instruction is being
reissued with a new date, updated version and signature authority to meet Chief of Naval
Operations’ (CNO) age requirement for Office of the Chief of Naval Operations instructions.
2. Cancellation. OPNAVINST 9110.1C.
3. Scope and Applicability. The provisions of this instruction are applicable throughout the
U.S. Navy, in particular units who operate, utilize, and manage a submarine operating within a
prescribed operating cycle and or operating interval.
4. Definitions
a. Test Depth. The depth to the axis of the hull prescribed by the detail and special
specifications for building the particular submarine, to which the ship is tested by actual
submergence.
b. Collapse Depth. The depth at which it is calculated collapse of the hull will occur. The
margin between test depth and collapse depth can be expected to decrease as the age of the
submarine increases or if the submarine is subjected to unusual strain.
c. Maximum Operating Depth. The depth of the axis of the hull for a particular submarine
which is authorized by Commander, Submarine Forces (COMSUBFOR) upon the
recommendation of Commander, Naval Sea Systems Command (COMNAVSEASYSCOM), as
the depth not to be exceeded in operations. This depth is normally the test depth, but may be
reduced in specific cases.
NOTE: Specification of depths greater than 800 feet is classified confidential.
5. Discussion. The factors in subparagraphs 5a through 5c are pertinent:
a. The fact that a submarine may on one occasion successfully submerge to a depth in
excess of maximum operating depth without serious leaks or damage is not surety of its being
able to submerge to the same depth without such leaks in the future.
