#hole_in_the_ground__excavation  a hole in the ground made by excavating
  supertype:  #artifact__artefact  a man-made object taken as a whole
  subtype:  #bore-hole__bore__drill_hole__drillhole  (mining terms) a hole or passage made by a drill; usually made for exploratory purposes
     subtype:  #shot_hole  drill hole for a charge of an explosive
  subtype:  #delf  (British colloquialism) an excavation; usually a quarry or mine
  subtype:  #ditch  a long narrow excavation in the earth
     subtype:  #drainage_ditch  a ditch for carrying off excess water or sewage
     subtype:  #irrigation_ditch  a ditch to supply dry land with water artificially
     subtype:  #sunk_fence__ha-ha__haw-haw__hawhaw  a ditch with one side being a retaining wall; used to divide lands without defacing the landscape
     subtype:  #trench  a ditch dug as a fortification having a parapet of the excavated earth
        subtype:  #approach_trench__communication_trench__communicationtrench  a trench that provides protected passage between the rear and front lines of a defensive position
        subtype:  #fire_trench  a trench especially constructed for the delivery of small-arms fire
        subtype:  #moat__fosse  ditch dug as a fortification and usually filled with water
        subtype:  #slit_trench  narrow trench for shelter in battle
     subtype:  #trench.ditch  any long ditch cut in the ground
        subtype:  #furrow  a long shallow trench in the ground (especially one made by a plow)
           subtype:  #gash__cut  a trench resembling a furrow that was made by erosion or excavation
  subtype:  #mine  excavation in the earth from which ores and minerals are extracted
     subtype:  #coal_mine__coalpit  a mine where coal is dug from the ground
     subtype:  #copper_mine  a mine where copper is dug from the ground
     subtype:  #goldmine__gold_mine  a mine where gold ore is found
     subtype:  #salt_mine  a mine where salt is dug
     subtype:  #silver_mine  a mine where silver ore is dug
     subtype:  #strip_mine__stripmine  an open mine (usually for coal) where the seams run close to the surface
     subtype:  #sulphur_mine__sulphurmine__sulfur_mine  a mine where sulphur is dug from the ground
  subtype:  #mineshaft  excavation consisting of a vertical or sloping passageway for finding or mining ore or for ventilating a mine
  subtype:  #stone_pit__stonepit__pit  a surface excavation for extracting stone or slate: "a British term for `quarry' is `stone pit'"
     subtype:  #chalkpit__chalk_pit__chalkpit  a quarry for chalk
     subtype:  #gravel_pit  a quarry for gravel
     subtype:  #trou-de-loup  a sloping pit with a stake in the middle used as an obstacle to the enemy
  subtype:  #pool  an excavation that is (usually) filled with water
     subtype:  #cistern  an artificial reservoir for storing liquids; especially an underground tank for storing rainwater
        subtype:  #cesspool__cesspit__sump  a covered cistern; waste water and sewage flow into it
        subtype:  #rain_barrel  a barrel used as a cistern to hold rainwater
     subtype:  #swimming_pool__swimming_bath__natatorium  pool that provides a facility for swimming: "`swimming bath' is a British term"
        subtype:  pm#heated_swimming_pool
        subtype:  pm#outdoor_swimming_pool
     subtype:  #wading_pool  a shallow pool for children
     subtype:  #water_jump__waterjump  a pool or stream in a steeplechase or similar contest
     subtype:  pm#spa
        subtype:  pm#in_room_spa
  subtype:  #root_cellar__cellar  an excavation where root vegetables are stored
  subtype:  #well  a deep hole or shaft dug or drilled to obtain water or oil or gas or brine
     subtype:  #artesian_well  a well drilled through impermeable strata into strata that receive water from a higher altitude so there is pressure to force the water to flow upward
     subtype:  #driven_well__tube_well  a well made by driving a tube into the earth to a stratum that bears water
     subtype:  #gas_well__gaswell  a well that yields or has yielded natural gas
     subtype:  #oil_well__oilwell  a well that yields or has yielded oil
        subtype:  #gusher  an oil well with a strong natural flow so that pumping is not necessary
        subtype:  #spouter.oil_well  an oil well that is spouting
        subtype:  #wildcat_well__wildcatwell__wildcat  an exploratory oil well drilled in land not known to be an oil field
     subtype:  #sump  a well or other hole in which water has collected
  subtype:  #working__workings  a mine or quarry that is being or has been worked

3 statements are about indirect instances of #hole_in_the_ground: wotif#graph1_on_http://www.wotif.com/Accommodation/viewdeal.asp?PropID=2667, wotif#graph1_on_http://www.wotif.com/Accommodation/viewdeal.asp?PropID=4384, wotif#graph1_on_http://www.wotif.com/Accommodation/viewdeal.asp?PropID=5241
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