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On December 8, 2023, the water filling for the hydrostatic test began in tank T-2201, which is part of the first phase of the receiving station for the Shenzhen Liquefied Natural Gas Emergency Peak Shaving Project. The challenging task of raising the pressure in the tank to the level required for the hydrostatic test was completed within ten months, achieving the target ahead of schedule by 23 days. Seawater was used for the hydraulic testing of these submerged LNG storage tanks. The water level in each tank reached 23.106 meters, with a water volume of approximately 128,600 cubic meters; the pressure was maintained for 48 hours. The water filling and extraction point is located on the western side of the tank area, by the sea. Five centrifugal pump sets are installed at this point; the inlet pipes are made of 12-inch carbon steel pipes, which connect to the outlet manifold of the centrifugal pump sets. These pipes run along the ground surface and are supported by pipes attached to the exterior walls, before reaching the bottom inlets at the top of the storage tanks. During the water injection period, the settlement amount was determined by observing the elevation changes at the 18 settlement monitoring points embedded at the outer edge of the upper surface of the concrete foundation of the LNG storage tank, with an interval of 20.0° between each monitoring point.