With the development of deep-sea fishing and marine ranching. the impact of undersea radiation noise of vehicles on marine organisms such as fish cannot be ignored . In order to assess the impact of radiation noise from undersea vehicles on marine life. the calculation model of safe working radius for an undersea vehicle was established according to the passive sonar equation and prop... https://poolsproductscanadas.shop/product-category/raypak-els-3-series-heater-parts/