Motor-driven pump assembly which can be used under water

A submersible motor-driven pump assembly formed of axially aligned, end to end joined vertically oriented modular units for use under water, said modular units including at least one electric motor unit having an upper end and a lower end surmounted by at least one pump unit connected to the upper end of said motor unit so as to rotate the pump, the improvement wherein said end to end joined vertically oriented modular units include an electric connection module situated beneath said at least one electric motor unit coaxially aligned therewith and having an upper end detachably fixed to the lower end of the motor unit, for electrically energizing said at least one motor unit, and said electrical connection module having a connector pin connected to a cable, said cable running upwardly therefrom externally of said assembly and being fixed thereto, said connector pin being mounted within said electrical connection module, said electrical connection module further including at least one inside connector member fixed to the upper end of said electrical connection module for effecting electrical connection at said upper end of said electrical connection module with said at least one electric motor unit at its lower end, and internal conductor means extending from said connector pin to said at least one inside connector member for supplying power from said cable to said at least one motor unit for rotating said pump.