VERTCRS["EPSG example wellbore local vertical CRS (ft)",
    VDATUM["EPSG example wellbore vertical datum"],
    CS[vertical,1],
        AXIS["local depth (d)",down,
            LENGTHUNIT["foot",0.3048]],
    USAGE[
        SCOPE["Wellbore survey."],
        AREA["Description of the extent of the CRS."],
        BBOX[-90,-180,90,180]],
    ID["EPSG",8897]]