![]() ![]() įollowing the incident, the Udaloy-class destroyer Admiral Tributs and the rescue vessel Sayany were dispatched from Vladivostok to provide assistance to the stricken submarine. Many of the injured were reported to have suffered from frostbite caused by the chilling effect of the gas. The number of injured was initially put at 21 but was later revised to 41 by the Amurskiy Shipbuilding Company, some of whose employees were among the injured. Twenty people died of asphyxiation in the accident. In high concentrations, it can cause narcosis, which progresses by stages into excitation, mental confusion, lethargy, and ultimately asphyxiation. The gas displaces oxygen and chemically interferes with combustion, enabling it to extinguish fires rapidly in enclosed spaces. Each compartment of a Russian submarine contains a LOKh station from which the gas can be delivered into that or adjacent compartments. The gas, a haloalkane refrigerant, is used in the Russian Navy's LOKh ( lodochnaya obyemnaya khimischeskaya – "submarine volumetric chemical") fire-suppressant system. The submarine's fire extinguishing system was triggered, sealing two forward compartments and filling them with R-114B2 gas ( dibromotetrafluoroethane, known as khladon in Russian). The accident occurred at 8:30 pm local time on 8 November 2008, during the submarine's first underwater test run. For this reason, it had a much larger than usual complement aboard, totaling 208 people, 81 military personnel and 127 civilian engineers from the shipyards responsible for building and outfitting the submarine. The vessel had not yet been commissioned by the Russian Navy and was undergoing plant tests under the supervision of a team from the Amur shipyard. Sequence of events Īt the time of the accident, Nerpa was undergoing sea trials at the Russian Pacific Fleet's test range in Peter the Great Gulf, an inlet of the Sea of Japan adjoining the coast of Russia's Primorski Krai province. The incident was the worst Russian submarine disaster since the sinking of Kursk in 2000. Three of the dead were Russian naval personnel and the rest were civilian employees of the Vostok, Zvezda, Era, and Amur shipbuilding yards. The high casualty count was attributed in part to the large number of civilians on board who were assisting with the testing before commissioning. Halon gas was released inside two compartments of the submerged submarine during the vessel's sea trials in the Sea of Japan, asphyxiating the victims or causing frostbite in their lungs. The accident was blamed on a crew member who was allegedly playing with a fire suppressant system that he thought was not operative. The K-152 Nerpa accident occurred aboard the Russian submarine K-152 Nerpa on 8 November 2008, which resulted in the deaths of 20 people and injuries to 41 more. ![]() Peter the Great Gulf, Sea of Japan, off the coast of Primorski KraiĪccident occurred on board the Russian submarine K-152 Nerpa An Akula-class submarine similar to K-152 Nerpa ![]()
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