Today we're honouring the inventor of the Submersible Pump, Armais Aruntunoff!
"1928 Russian oil delivery system engineer and inventor Armais Arutunoff successfully installed the first submersible oil pump. In 1929, Pleuger Pumps pioneered the design of the submersible turbine pump, the forerunner of the modern multi-stage submersible pump. In the mid 1960s the first fully submersible deep-well water pump was developed." ~ Wikipedia
If history's your thing, read more about Aruntoff and the submersible pump's historical development here.