Diving is a sport all avid travellers should take up. Our earth is mostly water, and there’s so much underneath the waves that most of us will never see. We decided to get our open water license a few years back, so we could experience more of the natural world below the surface of our seas and oceans. I still remember, vividly, swimming among the corals in the waters around Apo Island in the Philippines and underwater canyons around the Maltese islands.