テクニカルダイバー

noun

technical diver

A scuba diver trained in advanced techniques beyond recreational limits, such as decompression diving or using mixed gases.

• 彼かれはテクニカルダイバーの資し格かくを取とるために、減げん圧あつ潜せん水すいの訓くん練れんを受うけた。

  He underwent decompression diving training to get his technical diver certification.