Dunfield dug the pit area to a depth of 134 feet ( 41 m ) and a width of 100 feet ( 30 m ) by using a 70 - ton digging crane with a clam bucket .
That year , Robert Dunfield leased portions of the island .
Robert Dunfield dug the pit area to a depth of 134 feet ( 41 m ) and a width of 100 feet ( 30 m ) by using a 70 - ton digging crane with a clam bucket .
That year , Robert Dunfield leased portions of the island .