Many people suffer from ear problems during and after diving. Technical rebreather diver and underwater photographer Dr Michael Rothschild is an ear, nose and throat specialist in New York City. In this series, he walks us through some of the common causes of dive-related ear problems, and how to treat and prevent them.

In underwater photography, "scale" can mean a couple of things: how big or small a thing is or the myriad of tiny plates on the skin of a fish. We asked our contributors what their favorite underwater photos were that showed scale. And playing on the pun, they came back with a creative mix of macro, wide-angle and close-up abstract images.

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.