The USS Greeneville, the fast-attack submarine involved in a deadly collision with the fishing vessel Ehime Maru in 2001, is headed back to Pearl Harbor.

The Greeneville (Tenn.) Sun reported this weekend that the submarine left the Portsmouth Naval Shipyard in New Hampshire on Thursday after more than a year of upgrades.
The paper said the Greeneville is heading back to its homeport of Pearl Harbor.
While at the shipyard, the Greeneville underwent what the Navy calls a Depot Modernization Period, which includes systems maintenance and equipment upgrades.
The submarine was refueled, and was also to have many of its weapons and other systems upgraded, according to those familiar with the process.
On Feb. 9, 2001, the Greeneville performed an emergency surfacing manuever about 9 miles off Oahu’s south shore in a demonstration for civilian visitors.
As the submarine surfaced, it rammed the Ehime Maru, a fishery training ship for high school boys from Japan.
The Ehime Maru sank within minutes, killing nine crew members, including four students.
The Navy found the submarine’s captain, Cmdr. Scott Waddle, guilty of dereliction of duty and he resigned.
The U.S. government paid nearly $12 million in restitution to the Ehime Prefectural government and the Navy paid nearly $14 million to compensate the families of the victims.
A memorial to the Ehime Maru was built at Kakaako Waterfront Park in 2002.
The Greeneville, meanwhile, was the center of two more incidents. In 2001, it ran aground while entering port at Saipan and in 2002, it was involved in a collision with the USS Ogden during a personnel transfer off Oman.
And late last month, two sailors from the Greeneville were charged with beating a man and leaving him unconscious on a Portsmouth street.
Investigators arrested 22-year-old Gerald Smith and 23-year-old Sandy Portobanco and charged them with assault and witness tampering after police say they threatened a witness.