約9分ー素潜りダイビングに挑戦して見えた！スキンダイビングの安全管理の課題(課題把握及び意見編)～ダイビングポイント17箇所でダイビングした経験から～静岡県伊豆半島13箇所、沖縄県慶良間諸島など4箇所

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