{
  "format_version": "1.16.100",
  "minecraft:underwater_cave_carver_feature": {
    "description": {
      "identifier": "minecraft:underground_underwater_cave_carver_feature"
    },
    "fill_with": "minecraft:water",
    "width_modifier": 0.0,
    "replace_air_with": "minecraft:flowing_water"
  }
}