On the evening of October 10, the unmanned boat in a mixed minefield of MK-42 high-sensitivity mines and MK-52 low-sensitivity mines continuously blasted five MK-42 mines in half an hour, and then Sweeping a MK-42 mine and two MK-52 mines.
Then on August 16th, the second MK-52 mine was again exploded. The way to allow unmanned boats to sail slowly in the minefield.Īt 21:10 on August 12, 1972, the Chinese unmanned minesweeper exploded the first MK-52 mine at Haiphong Port, proving that the design was successful. Therefore, the main engine was closed and the motorboat engine was attached to the rear of the boat. Since the minimum speed of the 312 type boat is also 7.8 knots, according to the Vietnamese experience, the safe speed of the low-sensitivity MK-52 mine should be 2 to 4 knots. The US military discovered that there were several small boats in the Chinese anchorage after the reconnaissance flight three days later. Under the guidance of Vietnamese boats, they passed through secret shallow waterways, concealed during the day, sailed at night, crossed the US military blockade, and arrived at Haiphong Outer Harbour. Many ships in China were also trapped in it.įrom July 25th to 30th, 1972, five minesweepers sailed from Guangxi Pearl Harbor in batches. After the mine was blocked, there were 26 merchant ships in 8 countries trapped in Haiphong Port. At that time, the monthly throughput was 216,000 tons. Haiphong Port is the largest port in northern Vietnam. The first minesweeping team consisted of five minesweepers, one for each of the 057K and 058 minesweepers, two simple minesweepers modified by the navigational boat, and one 312 unmanned minesweeper. To this end, the East China Sea and South China Sea Fleet have successively organized the out-of-country mine-sweeping team, and sent personnel to form a “breaking mine investigation team” to understand the situation and bring back the advanced MK-52 mine fuze. You must be very Good research, China must further play a role." Commander Xiao Jinguang also emphasized support: "We must take advantage of this Dongfeng to grasp the construction of mine-clearing forces." China may encounter this problem in the future. The Navy is specializing in maritime struggle. In this regard, Premier Zhou Enlai and Vice Chairman Ye Jianying are very concerned and instruct the Navy: "The Navy wants to take enthusiasm. On the afternoon of the same day, the Vietnamese ambassador asked for Premier Zhou Enlai, on behalf of the Vietnamese government, to ask China to help mine. A large-scale mine-blocking blockade has been carried out on seaports such as Haiphong, Hongji, Jinpu and Huijiang. Subsequently, four aircraft carriers deployed in the Beibu Gulf can be prepared, and there are more than 100 sorties of take-off fighters. The outer ring of Haiphong, Hongji and other ports can safely leave within 72 hours. In the early morning of May 9, 1972, US President Nixon declared in a televised speech that he would impose a mine-blocking block on the northern coast of Vietnam. These new generations of acoustic fuzes and magnetic fuzes combined with mines have made the North Vietnamese Navy, which has only old-fashioned mine-sweeping equipment, unpredictable. Among them, MK-50 is an airdrop sound mine, MK-52 is an airdrop non-trigger sinking mine, and the fuse is a magnetic, acoustic and water pressure combined fuse. On March 5th, MK-50 and MK-52 mines were placed on Majiang in Qinghua Province. On the evening of February 27th, the US military began to put mines on Mingjiang, Huibaijiang, and Rimeijiang. The main purpose was to test the world public opinion and conduct a mine test. On January 19, 1967, the US military launched eight fake mines at Haiphong Port for the first time. During the Vietnam War, the United States dispatched aircraft carriers and carrier-based aircraft to conduct offensive brawls, blockade Vietnamese ports, and China promptly assisted and took the opportunity to exercise mine-clearing capabilities.
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