- The Mariana trench is located in the Pacific Ocean at a depth of about 11000 m below the surface of the water. The density of seawater is 1025 kg/m3. (a) If an underwater vehicle were to explore such a depth, what forces would the water exert on the vehicle’s observation window (radius = 10cm)? (b) For comparison, determinate the weight of a jetliner whose mass is 12x105kg.Take Patm = 1.013x105Pa