Say you are in some far-flung location where it will take quite some time to get to any recompression chamber. What do you do if you get decompression sickness? Get back in the water and recompress?

“Treat customers the way you want to be treated” is a tenet of client relations for which many businesses strive but, sadly, not all achieve. This concept of customer service was the primary building block with which Mark Derrick developed Dive Gear Express (DGX) since its infancy in 2002. In light of the five-star independent Google reviews from 97 percent of DGX patrons, I would say they are on the right track.

It certainly looks “prehistoric”—whatever that means. Cigar-shaped, blunt-snouted, with that slightly “sock-puppet-looking” smirk, the overall look of this big beastie is very much that of an ancestral shark, like some of the deep-water dogfishes, the sleeper sharks and others. Indeed, fossil remains similar to modern sevengills and sixgills are known from the Jurassic and perhaps much earlier.

Once considered an extreme activity reserved only for a fringe set of explorers and adventurers, technical diving has grown in popularity since the ‘90s and has become mainstream. However, technical diving is not for everyone. Aside from an advanced skill set, it also requires a certain mindset. How do you know if you have got it? Simon Pridmore offers insights into what makes a good technical diver.