"plongée sous-marine" meaning in French

{
  "etymology_templates": [
    {
      "args": {
        "1": "fr",
        "2": "plongée",
        "3": "sous-marin"
      },
      "expansion": "plongée + sous-marin",
      "name": "af"
    }
  ],
  "etymology_text": "From plongée + sous-marin.",
  "forms": [
    {
      "form": "plongées sous-marines",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "plongée sous-marine f (plural plongées sous-marines)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "fr",
          "name": "Underwater diving",
          "orig": "fr:Underwater diving",
          "parents": [
            "Water sports",
            "Sports",
            "Human activity",
            "Human behaviour",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "scuba diving"
      ],
      "id": "en-plongée_sous-marine-fr-noun-F~eUG8bS",
      "links": [
        [
          "scuba diving",
          "scuba diving"
        ]
      ],
      "tags": [
        "feminine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/plɔ̃.ʒe su.ma.ʁin/"
    }
  ],
  "word": "plongée sous-marine"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "fr",
        "2": "plongée",
        "3": "sous-marin"
      },
      "expansion": "plongée + sous-marin",
      "name": "af"
    }
  ],
  "etymology_text": "From plongée + sous-marin.",
  "forms": [
    {
      "form": "plongées sous-marines",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "f"
      },
      "expansion": "plongée sous-marine f (plural plongées sous-marines)",
      "name": "fr-noun"
    }
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "French compound terms",
        "French countable nouns",
        "French entries with incorrect language header",
        "French feminine nouns",
        "French lemmas",
        "French multiword terms",
        "French nouns",
        "French nouns with red links in their headword lines",
        "French terms with IPA pronunciation",
        "fr:Underwater diving"
      ],
      "glosses": [
        "scuba diving"
      ],
      "links": [
        [
          "scuba diving",
          "scuba diving"
        ]
      ],
      "tags": [
        "feminine"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/plɔ̃.ʒe su.ma.ʁin/"
    }
  ],
  "word": "plongée sous-marine"
}