Drilling a well in soil without stone

This guy is drilling wells in sand and clay soils, with a simple attachement to a power drill.
15 min video

Cool! I have a “hole hawg” gear driven drill that is much more powerful than a ordinary 1/2” chuck drill. I wonder how deep he can go before the friction becomes too much?

I would say friction is very minimal since the hole is so much bigger than the boring shaft.