Their lucky escape carries many lessons, not least the risks of taking off a lifejacket, even briefly for a good reason. But it is also a useful illustration of how dangerous even a slight current can be. Sea currents are not like the flow of a river, they are not always obvious from an anchored boat on a sunny day in calm water not far from shore.
It might not be until the holidaymaker has dived off the boat, enjoyed a swim and decides to return to the boat that the impossibility becomes apparent. At that point, another hazard comes into play. Jesse Drake, an experienced diver and boatie, did not try to fight the current for too long. Many would not have his mental control.
Everyone has heard or read the water safety advice that when caught in a rip you should raise your hand for help and go with the flow rather than fight it. But that is easier to say than to do. The beach or the boat seems not far away, the natural human urge is to try your utmost to reach it. You swim for all you are worth, you think you have the strength, you give it everything you have and you look up to find you are no closer.
You panic. You know you have to control your mind now, it's not easy. You have to tell yourself that your own mind is now the greatest threat to your life. If you can stay calm, stay afloat and drift, you can survive. If you panic and exhaust your strength, you probably will not.
Drownings at beaches around New Zealand are almost a daily occurrence in the summer holidays. The sun is shining, the water is warm, the sea looks calm. But be always aware of the current and no matter how gently it seems to be moving you, take care. And if it gets the better of you, keep your head.