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<p>[QUOTE=&quot;davidh, post: 2286249, member: 15062&quot;]The only way they can get below the level of the water inlets is to start dropping 20&#039; wide caissons to seal the shaft sides and use a clamshell excavator to dig out the debris down to the vault top.&nbsp; Then find someone who doesn&#039;t care about dying and send him down to complete the dig.[/QUOTE]</p><p><br /></p>

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