I think the real trick would be getting the screw started. Once it got a bite I
imagine running it down wouldn't be that hard. Maybe a big rental air impact
ratchet, gasoline compressor and an "extension" of galvanized pipe? A lot will
depend on what the bottom is made of.

This ratchet attaches temporarily to
the top of the screw.

I had a 10 foot helix driven into the floor of Blackwater Sound in Key
Largo. They used a hydraulic motor to drive it and it cost me $1200.