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On April 27, 2021, the day of spring tides during the April full moon "Pink Moon," terrifyingly fast tidal currents with a tidal range of 302 cm in Hario Seto in Sasebo City surge from Omura Bay into Sasebo Bay, causing large whirlpools to form all over the place. The fast tidal currents, which can reach speeds of over 10 knots, are frightening. This video was shot using drone footage, and includes some impressive scenes. Please take a look.