#ocean_floor__oceanfloor__ocean_bottom__oceanbottom__seabed__sea_bottom__seabottom__Davy_Jones's_locker__Davy_Jones  the bottom of a sea or ocean
  supertype:  #bed.natural_depression__bottom  a depression forming the ground under a body of water; "he searched for treasure on the ocean bed"
  subtype:  #abyssal_zone__abyssalzone  the deep sea (2000 meters or more) where there is no light
  subtype:  #continental_shelf__continentalshelf  the relatively shallow (up to 200 meters) seabed surrounding a continent
  subtype:  #continental_slope__continentalslope__bathyal_zone__bathyalzone__bathyal_district__bathyaldistrict  the steep descent of the seabed from the continental shelf to the abyssal zone

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