You know it when you read something written by someone who's had the same experience as you...'Towards the end of this dive and in just 6m of water we came across one of the most impressive and memorable things I have seen whilst diving - a ball of jacks spiralling from 6m to the surface. There were simply thousands, their silver bodies flashing as they twisted and caught the light from the surface. At one point they were actually spiralling around us encasing us in a giant swirling, living sphere. This is something I will never forget and what we didn't know at this stage is that the very next day we would find ourselves caught in an even denser ball, with even more jacks and this time with white-tip reef sharks circling the perimeter at a nearby dive site called Turtle Patch. The photographs I have of this phenomenon in no way do it justice and by no means illustrate the enormous number of fish involved, so it's lucky I videoed it too! This can now be seen on the Turtle Patch page.'