渦の動画は１分２７秒あたりからです。鳴門海峡の渦潮を、淡路島福良港から出ているうずしおクルーズ船咸臨丸に乗って見てきました。The video of the vortex is from around 1 minute 27 seconds. I have watched the whirlpools of the Naruto Strait on the Uzushio cruise ship Kanrin Maru, which is departing from Fukura Port, Awaji Island.