Although the best time to dive the Blue Hole is around noon. The crowds have gone and it's so light even at the bottom you could read a book.

It's lucky the husband caught his wife when he did. If she had gone much deeper he would have had to let her go, or risk joining her involuntarily.

In another Blue Hole, this time in Egypt a few years back, a girl did just that, but then for whatever reason carried on down to the bottom. We retrieved her the next day, from just below 400ft. Her tank was still half full.

I used to train suitable divers outside our own reef, taking them down in stages until they reached 150ft. It's much easier and safer there, as you're just over the bottom the whole way down. Then I'd take them to the BH and they would wonder what all the fuss had been about!