The rise in awareness and interest of marine resources and resulting tensions has created the need for security and assessment of deploying a ship in a region. Vulnerability assessment is the study of how vulnerable one’s ship is to detection by others. It is done by using the sonar equation and calculating the reverse signal to noise ratio in the surroundings. The survivability of the naval ship is the capability of a warship to avoid or withstand a hostile environment. The survivability of the naval ship assessed by three categories (susceptibility, vulnerability and recoverability).