Paul Allen's Research Vessel Located Two Japanese Carriers Sunk in Midway

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The sequence of events are found in tweets at the right lower corner of the home page at Vulcan, Inc.
https://vulcan.com

In chronological order:
(1) R/V Petrel Discovers Japanese Fleet Carrier Sunk During Battle of Midway. PaulAllen.com, Oct 17, 2019
https://paulallen.com/rv-petrel/ ... ng-battle-of-midway
("The Japanese aircarft [sic] carrier IJN [Imperial Japanese Navy 大日本帝国海軍] Kaga, part of the six-fleet carrier that launched planes that attacked Pearl Harbor in 1941, has been discovered by the crew of R/V Petrel. * * * [Kaga's] crew realized the damage was beyond repair, and the escorting destroyer Hagikaze launched two torpedoes at the ship to effectively scuttle it. * * * Along with Kaga, three other Japanese fleet carriers – Akagi 赤城 [In commission 1937-1942, displacement similar to Kaga; named after 赤城山], Sōryū 蒼龍 [In commission 1937-1942, displacement similar to Hiryu] and Hiryū 飛龍 [In commission 1939-1942, Displacement: 17,600 metric tons (standard)] – were sunk during the battle.  The crew aboard R/V Petrel spent several weeks surveying the massive area, documenting more than 500 square nautical miles, all within the Papahanaumokuakea Marine National Monument. * * * 'This project is significantly different from previous missions as it required a level of investigation, analysis and survey of a carrier-based engagement initially separated by over 150nm, a total area covering thousands of square nautical miles' ")

Note:
(a) Japanese aircraft carrier Kaga
https://en.wikipedia.org/wiki/Japanese_aircraft_carrier_Kaga
(table: In commission 1928-1942, Namesake: Kaga Province 加賀国, Displacement: 38,200 long tons (38,813 t[onnes]) (standard) )

displacement (ship)
https://en.wikipedia.org/wiki/Displacement_(ship)

(b) "R/V Petrel"
(i) "research vessel (RV or R/V)" en.wikipedia.org for "research vessel."
(ii) petrel
https://en.wikipedia.org/wiki/Petrel
(iii) The vessel is owned by Vulcan, Inc (1986- ; based in Seattle), of Paul Allen.

(c) Japanese destroyer Hagikaze  萩風
https://en.wikipedia.org/wiki/Japanese_destroyer_Hagikaze

Japanese nou hagi is clover, to which shamrock belongs.
(d) Papahānaumokuākea Marine National Monument
https://en.wikipedia.org/wiki/Papahānaumokuākea_Marine_National_Monument
(name "inspired by the names of the Hawaiian creator goddess Papahānaumoku and her husband Wakea")

(e) "a carrier-based engagement initially separated by over 150nm"
(i) Section 1.1 "Yamamoto's plan: Operation MI [both are sectional heading]: Midway Atoll, several months before the battle. Eastern Island (with the airfield) is in the foreground, and the larger Sand Island is in the background to the west.
Typical of Japanese naval planning during World War II, Yamamoto's battle plan for taking Midway (named Operation MI [selected from 五十音]) was exceedingly complex. It required the careful and timely coordination of multiple battle groups over hundreds of miles of open sea. * * * Yamamoto felt deception would be required to lure the US fleet into a fatally compromised situation. To this end, he dispersed his forces so that their full extent (particularly his battleships) would be concealed from the Americans prior to battle. Critically, Yamamoto's supporting battleships and cruisers trailed Vice Admiral Chūichi Nagumo's 南雲 忠一 [南 has either 'nan' or 'na' as Chinese pronunciation] carrier force by several hundred miles. They were intended to come up and destroy whatever elements of the U.S. fleet might come to Midway's defense once Nagumo's carriers had weakened them sufficiently for a daylight gun battle; this tactic was doctrine in most major navies of the time." (footnotes omitted).
(ii) Distance between American and Japanese (at least its vanguard carrier) fleets?

Battle of Midway. Encyclopaedia Britannica, undated
https://www.britannica.com/event/Battle-of-Midway
("The battle began on June 3, 1942, when US bombers from Midway Island struck ineffectually at the Japanese invasion force about 220 miles southwest of the US fleet")
(iii) "500 nautical miles (580 miles; 930 kilometers) to the west-southwest of Midway" Atoll: en.wikipedia.org for "Battle of Midway."

(2) Today (Oct 21) the same announces the finding of IJN Akagi.
(a) In total, Japan lost all four aircraft carriers that participated in Battle of Midway, whereas lost 1 (USS Yorktown) of the three carriers that participated (the other two were USS Enterprise and USS Hornet).
(b) "In May 1998, almost 56 years later, an expedition led by the National Geographic Society in conjunction with the US Navy found the Yorktown 3 miles (5 kilometers) below the surface."  Caleb Jones, Deep-Sea Explorers Find Japanese Ship That Sank During WWII. Associated Press, Oct 18, 2019.
(c) USS Yorktown (CV-5)
https://en.wikipedia.org/wiki/USS_Yorktown_(CV-5)
(table: In commission: 1937-1942, class: Yorktown class, Displacement: 25,500 long tons (25,900 t) (full load) )