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In this Wednesday, Oct. 16, 2019, photo, Vulcan Inc. director of subsea operations of the Petrel, Rob Kraft looks at images of the Japanese aircraft carrier Kaga, off Midway Atoll in the Northwestern Hawaiian Islands. Deep-sea explorers scouring the world's oceans for sunken World War II ships are honing in on a debris field deep in the Pacific. The research vessel called the Petrel is launching underwater robots about halfway between the U.S. and Japan in search of warships from the Battle of Midway. (AP Photo/Caleb Jones)

MIDWAY ATOLL, Northwestern Hawaiian Islands (AP) — A crew of deep-sea explorers and historians looking for lost World War II warships have found a second Japanese aircraft carrier that went down in the historic Battle of Midway.

Vulcan Inc. director of undersea operations Rob Kraft said a review of sonar data captured Sunday shows what could be either the Japanese carrier Akagi or the Soryu resting in nearly 18,000 feet of water in the Pacific Ocean more than 1,300 miles northwest of Pearl Harbor.

The researchers used an autonomous underwater vehicle, or AUV, equipped with sonar to find the ship. The vehicle had been out overnight collecting data, and the image of a warship appeared in the first set of readings Sunday morning.

To confirm exactly which ship they've found the crew will deploy the AUV for another eight-hour mission where it will capture high-resolution sonar images of the site. The initial readings were captures using lower resolution sonar. The high-resolution scans will allow the crew to measure the ship and confirm its identity.

The find comes on the heels of the discovery of another Japanese carrier, the Kaga, last week.

"We read about the battles, we know what happened. But when you see these wrecks on the bottom of the ocean and everything, you kind of get a feel for what the real price is for war," said Frank Thompson, a historian with the Naval History and Heritage Command in Washington, D.C., who is onboard the Petrel. "You see the damage these things took, and it's humbling to watch some of the video of these vessels because they're war graves."

Sonar images of the Kaga show the bow of the heavy carrier hit the seafloor at a high rate of speed, scattering debris and leaving an impact crater that looks as if an explosion occurred in the ocean. The front of the vessel is buried in mud and sediment after nose-diving about 3 miles to the bottom.

The U.S. bombs that struck the Kaga caused a massive fire that left it charred, but the ship stayed mostly together. Its guns, some still intact, stick out the side.

The crew of the research vessel Petrel is hoping to find and survey all lost ships from the 1942 Battle of Midway, which historians consider a pivotal fight for the U.S. in the Pacific during World War II.

The battle was fought between American and Japanese aircraft carriers and warplanes about 200 miles (320 kilometers) off Midway Atoll, a former military installation that the Japanese hoped to capture in a surprise attack.

The U.S., however, intercepted Japanese communications about the strike and were waiting when they arrived. More than 2,000 Japanese and 300 Americans died.

The expedition is an effort started by the late Paul Allen, the billionaire co-founder of Microsoft. For years, the crew of the 250-foot Petrel has worked with the U.S. Navy and other officials around the world to locate and document sunken ships. It has found more than 30 vessels so far.

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