A opening may be created by repeatedly dropping a pointed pole on the ground. If the pole is hollow, soil will enter the pipe as well as a sample will be recovered. Therefore the most popular method of recovering a sample of soil is to push or hammer a tube into the ground. certainly the initial kinds of drilling rig to do this was the Banka drill, which was entirely man powered and used to prospect for alluvial minerals and, in the writerís experience, for gold and diamonds. Casing was driven into the ground and samples extracted from within it using a sampling tool (the shell) raised and dropped to depths of the order of 10 m by man power. Drillers came sometimes from families devoted to this work and started at an early age; by maturity they had achieved a physique suggesting that it would be unwise to quarrel with them.