May 2018: I am an endurance open water swimmer and just finished a 20 hour Molokai channel swim in Hawaii. I was followed by a large oceanic white-tipped shark for 5 hours with only Ocean Guardian FREEDOM7s for protection. This was witnessed by an official swim observer and the crew of my pilot boat and was an incredible experience for us all.

Before this, I was sceptical however I watched as this 8-12 foot shark flinch when it came...