Hand digging a well in Mexico

No machinery, no electric, just human power:    

I rarely use that site for video and decided to make an exception (first exception in month or two). Well I can say that it looked easy compared to the soil here. So it looked less rocky than what I have. I dug a shit pit (1m deep / cubic) and that took a week (was just me doing it). I really couldn't push any more - used too much energy for little progress. Of course with more people more is possible but this environment looked quite sandy / less stoney.... and here (and I think many places) it's more soil + stone and then clay - often quite heavy after 50cm or a metre.
I looked at the video because I thought there may be a technique for me digging a well in my kind of area... so it was good to see people doing in themselves there in Mexico... but also if there is a 'handy' way to dig a well without machines for clay soil / stone I'd like to hear it, thanks