What did the men do after they got aboard the rig? They helped to drill holes thousands of feet beneath the sea, to get the petroleum, or oil, that is so necessary to our daily living."" You can't be more efficient, more plate-glass-clear than that. Attending to every detail, Neal explains the whole complicated business of offshore oil production from the formation of oil reserves under the Continental Shelf to the operation of a drilling rig to the possibilities of pollution--with the arguments pro and con further exploration. While he may appear to bend over backwards to give both sides equal weight--and avoid commitment--Neal's overall presentation, plus the truly illustrative photos, enables the reader to understand the risks as well as the benefits. Like the Zim Machine Tools, etc. series, this is for youngsters who want and appreciate facts: the subject is not glamorous and Neal doesn't gussy it up.