19411On February 7th, Japan attacked Pearl Harbor, and the battleship Oklahoma became one of the first targets. Japanese planes filmed the attack on Pearl Harbor. In the photo taken by the Japanese plane above, you can clearly see the battleship berth of Pearl Harbor. The place where the water column flies in the photo is the position of the battleship Oklahoma. Oklahoma is the second Nevada-class battleship, its main feature is equipped with turrets. In this way, the firepower of the 14-inch 10 main gun can be realized by four turrets, which reduces the length of the hull, and the saved weight can strengthen the armor, so that the thickest armor belt is 13.5 inches, and the thickest turret armor is 18 inches. At the same time, the "Oklahoma" was also the first American warship equipped with an oil-fired boiler. The fuel has a high calorific value, so it does not need a group of people to shovel coal, which expands the voyage of the battleship. The standard displacement in Oklahoma is 2794 1 ton, the full-load displacement is 28856 tons, and the length is 178 meters. The power is 24,800 HP and the maximum speed is 20.5 knots. 1920 During the Japanese attack on Pearl Harbor, the Oklahoma was hit by five torpedoes and sank into the berth. After salvaging, you can see the terrible situation of torpedo hitting, and the armor belt is broken in a large area. As the sinking position of the Oklahoma blocked the waterway, the salvage work began at 1942. Because the sunken ship was upside down, a hole was made in the hull to pump out the residual fuel, and then a lot of air was pumped into the ship to discharge the accumulated water. This photo of the posing salvage commander can clearly see the sinking state of the ship. In order to unload the fuel oil, 12 winches were arranged on the shore, and the ship was pulled to the scaffold on the ship with steel cables. The winch on the land was connected with the ship's righting process that the workers saw when handling the connecting steel cables in the air. At this time, the hull inclination is 132 degrees. At this time, the hull inclination is 109 degrees. The hull is righted 90 degrees, the hull is righted 40 degrees and the hull is righted 34 degrees. The turret is still in the dry dock. After the ship is basically righted, it is towed into the dry dock to pump water. On the side that was not hit by a torpedo, the battleship Wisconsin was moored with the hull of the Oklahoma without a turret. It can be seen that most of the battleships sunk in Pearl Harbor were salvaged and put into active service. However, due to the serious damage of the Oklahoma, it lost the value of re-service. After the ammunition and superstructure on board were dismantled, the hull was sold to a shipyard. On the way to the shipyard, the Oklahoma sank in the storm and almost dragged the tugboat to the bottom of the sea. This also makes it a battleship that sank twice. Oklahoma Memorial Hall Oklahoma Memorial Hall