The Navy said Saturday that the USS Greeneville had been practicing an emergency surfacing maneuver when it collided with a Japanese fishing ship Friday in waters off Diamond Head.
A massive search continues for nine people missing from the sunken ship Ehime Maru.
The Japanese vessel was split open and sank about 20 miles from Pearl Harbor after the submarine surfaced under it Friday.
An investigation into that maneuver is under way.
The ship, which had teen-age students aboard, sank ten minutes after being rammed.
Coast Guard teams rescued 26 crew members.
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