With their newfangled electrical and seismographic prospecting instruments, petroleum geologists have found indications that oil formations may lie as deep as 25,000 ft. below the earth's surface. Until the visible supply of oil begins seriously to dwindle, probably no one will try to drill five miles. Meanwhile, in California's San Joaquin Valley, Continental Oil Co. has bored to 15,004 ft.—nearly three miles. This well, prosaically designated as K.C.L. A2, is the deepest hole ever made in the Earth. Having brought up oil from 13,100 ft., it is also the deepest producer.
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