The recent incident of the US military underwater drone that was caught in China in the South China Sea has finally come to an end, and the Chinese Navy has returned it to the United States.
The incident was carried out by the US Navy Bodic to send two underwater drones to conduct marine exploration near the Subic Bay in the South China Sea. When the exploration was about to be completed and the submarine was ready to be reclaimed, one of the underwater drones was taken by the Chinese Navy. The speedboat sent out approached and was taken away.
An anonymous US military official said that the US military was conducting legal military investigations in the South China Sea. The Chinese Ministry of National Defense said that an unidentified device was found in the relevant sea area of ​​the South China Sea. In order to ensure the safety of navigation, it was salvaged for verification.
US President-elect Trump said on Twitter that China’s stealing of US Navy underwater drones in international waters is unprecedented. Probably too excited, Trump misspelled the unprecedented. (wrongly unprecedented into unpresidented, a non-existent word)
So what is this underwater drone that has been making trouble recently?
According to Wired and CNBC, it is actually an underwater unmanned glider, a classification of underwater driverless tools. Developed by Teledyne Brown Engineering, it can be operated in accordance with pre-programmed procedures, without remote control.
The machine length of about 1.5 meters is similar to that of a torpedo. Equipped with organic wings and tail fins and an internal adjustable buoyancy device. When working underwater, the glider uses the gravity to naturally dive, and then uses the internal buoyancy device to generate buoyancy rise. In the process of floating up and down, the lift generated by the wings on both sides of the fuselage converts the thrust required for advancement, thereby completing the gliding motion under water.
Because it only needs to consume electricity when changing the floating and dive state, this type of water glider is characterized by low power consumption, long cruising range and working depth of 6,000 meters.
It is mainly used to record major marine hydrological data such as ocean temperature, salinity and density, and it can also provide short-term weather conditions and long-term climate models for oceanographers. The US Navy uses these data to develop weather forecasts for ocean-going vessels, and they have 130 similar gliders.
This type of equipment has been around for more than half a century. According to Wikipedia, the world's first underwater drone was invented in 1953 by Dimitri Rebikoff.
But in those days, the underwater drones were too remote to operate. Rebikoff's underwater drones needed to be connected to the working mother ship with a tether wrapped with copper and fiber, and then the operator passed the exercise command to Drone.
The earliest use of underwater drones for military purposes was the SPURV developed by the US Navy in 1957, with a maximum working depth of 3,000 meters, battery-driven, and a single battery life of 4-5 hours. The US military mainly used it to collect marine hydrology. data.
Up to now, military drones and commercial underwater drones are not much different in terms of technical principles. Many oil companies will use it for exploration, and some search and rescue missions will be used. After the Malaysia Airlines Flight 370 accident, the US Navy attempted to search for debris on the 5,000-meter-deep seabed using the Bluefin-21 underwater drone.
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