Jeffrey undertaking a helmet dive with surface air supplementing his tank supply. A communications cable keeps him in touch with his supervisor while also providing an identifiable trace back to the surface.
地表の空気をタンクに補給しながらヘルメットダイブを行うジェフリー。通信ケーブルで上司と連絡を取り合いながら、地表に戻るトレースも確認できる。
