I have seen it done years ago in NC. The pump part was, in effect, a long fairly thin nozzle. The piling was placed upright and the nozzle run down beside it. As the nozzle blasts the mud out, the piling sinks into the hole. I don't recall if they did anything to force mud back into the hole or if it just happened on its own. It looked like they were getting the piling 5-6' deep in the mud.
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