Strong currents frequently accompany high surf and rapid tide changes and can be recognized as a turbulent channel of water between areas where waves are breaking. Wave one or both hands in the air, and scream or call for help. Swim diagonally to the current, not against it. However, this condition can occur even when the water appears to be calm. Be very cautious when walking along rocky coastlines where waves are breaking.
Rocks become slippery and are sharp, abrasive lava stone.
Lava is very porous and it crumbles easily. Don't ever go into the wet rocky zone. The ocean is unpredictable and has been known to wash people away. Don't put yourself in a position where you could be swept away. And, just when you thought it was safe to read on . . .