The 2020 "Huanghai No.4" maritime search and rescue comprehensive exercise is held in the waters of east China's Lianyungang. The exercise is divided into four subjects: maritime ship security, personnel overboard rescue, ship oil spill removal, and ship fire fighting. The drill was conducted in response to the current construction of many ships in the port waters, the complex navigational environment, the high risk of marine pollution, and the difficulty of rescue.