Suppose that a submarine inadvertently sinks to the bottom of the ocean at a depth of 1000m. it is proposed to lower a diving bell to the submarine and attempt to enter the conning tower. what must the minimum air pressure be in the diving bell at the level of the submarine to prevent water from entering into the bell when the opening valve at the bottom is cracked open slightly? give your answer in absolute kilopascal. assume that seawater has a constant density of 1.024 g/cm3.