An ironic consequence of even vertical tradional oil and/ or natural gas drilling is that there is often a minor to major subsistance (lowering ) of the elevation as the trapped deposit is removed. It is not always predictable, and where and how much depends on the underlying sub strata (shales, clays, sediment, shelves of bedrock, gravels, ect, ect) With modern ground penetrating radars it`s better understood than in the past, but still...Interestingly, read somewhere down South where oil was removed from a swampy area, and over several yrs later the area "settled" and actually created a deeper area that became a fine fishery! If it was done ACCURATELY (good luck with THAT !) you could selectively and EXCESS PROFITABLY deepen a shallow, algea choked local lake....did mention that apparently this technology also is now available from satalites? HMM...Get PAID to deepen a shallow potential summer cess pool (to the benefit of an entire local area) AND help FUND the Park`s recovery atleast...again, would DEMAND a concrete containment dome (North Sea type) and gravity shut offs a man can operate AND containment ON SITE before they drill 1`....