These are just plain weird. Evidently there are unknown very fast creatures that hate churned up sea water:
https://www.youtube.com/watch?v=zJWeVLs40Bg
https://www.youtube.com/watch?v=C25RTDXFNWY
https://www.youtube.com/watch?v=SW9dk4xs83Q
https://www.youtube.com/watch?v=zJWeVLs40Bg
https://www.youtube.com/watch?v=C25RTDXFNWY
https://www.youtube.com/watch?v=SW9dk4xs83Q