Wreckage of USS Indianapolis found in Philippine Sea

"We've located the wreckage of the USS Indianapolis in Philippine Sea at 5500m below the sea."

That tweet from Microsoft co-founder Paul Allen around 12:20 p.m. Saturday confirmed what many have been searching for since the ship was sunk on July 30, 1945.

Allen, an entrepreneur and billionaire who is leading a 13-person team on his 250-foot research ship, the R/V Petrel, said the wreckage was found at a depth of more than 18,000 feet.

The heavy cruiser, carrying 1,195 sailors and Marines, was torpedoed by a Japanese submarine while sailing back to the Philippines after delivering components for "Little Boy," the atomic bomb that helped end World War II. It took only 12 minutes to sink.

While 900 crewmen made it through the initial sinking, only 316 survived to be rescued when help arrived five days later on Aug. 2, 1945. Many had died of exposure or thirst, drowned or were attacked by sharks.

Families of those aboard the ship found out about the deaths of their loved ones just as the rest of the country was celebrating the conclusion of World War II.

Updated info: USS Indianapolis historians resolve mystery of how many men died in 1945 attack

Another find: Researchers find Japanese sub that sunk USS Indianapolis

The latest break in the search for the wreckage came in July 2016, when the Naval History and Heritage Command Communication and Outreach Division reported that a sailor had confirmed that a tank landing ship, LST-779, had passed the Indianapolis 11 hours before the torpedo struck. That backed up the testimony of Captain Charles McVay III and was confirmed by deck logs.

That finding narrowed the search to 600 square miles of open ocean

“To be able to honor the brave men of the USS Indianapolis and their families through the discovery of a ship that played such a significant role in ending World War II is truly humbling,” Allen said in a statement. “As Americans, we all owe a debt of gratitude to the crew for their courage, persistence and sacrifice in the face of horrendous circumstances. While our search for the rest of the wreckage will continue, I hope everyone connected to this historic ship will feel some measure of closure at this discovery so long in coming.”

Maria Eck Bullard, the daughter of now-deceased survivor Harold Eck, received the surprising news in a phone call Saturday morning. Bullard is the chair of the USS Indianapolis Second Watch Organization, which focuses on keeping the next generation families of the entire final sailing crew connected and remembering the legacy of those who died.

Finding the ship was one of many of the survivors and their families' goals, she said.

"It's their final resting place so its kind of sacred ground," Bullard said. "It has brought the relief of some closure, but I do think it’s also a very sensitive subject."

She said she has not spoken with Allen yet, and she worried about all of the families who found out about the news from social media or news stories.

Allen’s team is still surveying the site of the wreckage and plans to conduct a live tour of the wreckage in the next few weeks. The crew is working with the Navy and plans to honor the remaining 22 USS Indianapolis crew members and families of crew members.

"Even in the worst defeats and disasters there is valor and sacrifice that deserves to never be forgotten," Sam Cox, director of the Naval History and Heritage Command, said in a statement. "They can serve as inspiration to current and future sailors enduring situations of mortal peril. There are also lessons learned, and in the case of the Indianapolis, lessons re-learned, that need to be preserved and passed on, so the same mistakes can be prevented, and lives saved."

In March 2015, an Allen expedition team discovered the remains of the Japanese battleship Musashi, and this past March, his team found the Artigliere, a World War II destroyer.

The shipwreck was the subject of the 2016 movie "USS Indianapolis: Men of Courage" staring Nicolas Cage.

Learn more about the heroes of the USS Indianapolis:

Rest in peace: Closure, finally, for USS Indianapolis survivor

USS Indianapolis survivor: 'That first morning, we had sharks'

Retro Indy: The sinking of the USS Indianapolis

Timeline: Remembering the USS Indianapolis

The ones they left behind: Remembering their lost 'sailor boys'

More: Lost at sea, remembered at home

More: Hundreds mark 70th anniversary of USS Indianapolis attack

IndyStar social media editor Allison Carter contributed to this story.

Follow IndyStar digital content editor Leigh Hedger on Twitter: @lhedger.

Call IndyStar reporter Kaitlin Lange at (317) 432-9270. Follow her on Twitter: @kaitlin_lange.