Players report they are being attacked in shallow waters and even through land as sharks are clipping through the surface. In some cases players may be dragged under the world though they should be returned to the surface when the shark lets go - please let me know below if you are not.
Sharks may also attack rafts on the beach or clip through ships.
There are no workarounds for this issue.
Please let me know if you have been trapped under the world, if sharks have attacked your beached raft (and if you were on it at the time) or if a shark has clipped/swam through a ship to attack you.