I saw a diver lose a fin in a heavy current situation at Brothers Island in Egypt, and she struggled to find and catch the fin (which unbeknownst to her, was positively buoyant), and by the time she put it back on, she was hopelessly separated from the group as a result and ended up surfacing and sitting out the dive. I sort of inwardly smirked, and thought it would never happen to me. On the very next dive, in the same strong current, a fin popped loose on me. I was mindful of her story about the positively buoyant fin, immediately spotted mine (which was similarly positively buoyant), grabbed it, and made a negative descent to the bottom — where I held on to a rock while I put my fin back on, and then dragged myself hand over hand along the bottom until I rejoined the group. About 5 minutes later, I saw my first and only thresher shark, up close. Moral of the story: learn from others’ experiences, don’t think “it” (whatever “it” is) can’t happen to you, and don’t smirk, inwardly or outwardly.