Dear Sir,

I am unable drill below 60 ft in Chennai, Manapakkam area. The local drillers refused to drill below this level as their drill bit is getting obstructed by the small stones. They worry their bit may be damaged. I tried twice with different drillers and failed both times at this depth. The stones are small similar to the gravels used for roads and building. As soon as they remove the drill bit the stones closes the hole and the pipe is not getting below 50 ft.

Need your kind advise.

Best Regards, T. Dharmasivam,