There are beautiful corals and hidden fishes to find on the seabed, so much so that one can easily get distracted. Even so, divers or swimmers will only need to worry about predators such as sharks, eels, etc., or poisonous sea creatures, and probably might have some protective gear to defend against them. But no one will expect to face a great serpent in the waters. The great serpent swoops down on its prey with incredible speed and unless you can swim like a fish, there is definitely no escape especially where you are under the sea.
