Great replies on "bad day" but in oil and gas exploration you have to be certain about the estimated measurements to "TD" meaning "Total Depth" to the end of the exploratory drill string to find the best oil production rock layers. When using semi-submersible platforms for exploration drilling and costing up to $250K in daily lease costs you have to be accurate as possible to where expect to find the oil/gas reservoir below sea bottom before the rig operations stops drilling due to no significant hydrocarbon logging and declares a dry hole. Mixing my Imperial and metric measurements in my analysis was always in the back of my mind as to whether or not I made a mistake. I triple checked everything.

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