James Bond has located his nemesis ' secret undersea research chamber . The chamber is spherical with an external diameter of 5.20 m. The mass of the chamber, when occupied , is 74400 kg. It is anchored to the sea bottom by a cable and the top of the chamber is 100 m below the sea surface. Take the density of sea water to be 1020kg / (m ^ 3) and note that the volume of a sphere is V = 4/3 * pi * r ^ 3