Nothing is guaranteed in scuba diving. We all know that the ocean delivers what it wants to deliver each time we descend. Our sport is defined by that unpredictability. Unforgettable moments arrive; we savor them; and we dive again the next day hoping for more.  The first time you saw a turtle underwater or watched a manta ray glide by; the first time a teeming coral reef came into focus or a shipwreck appeared out of the gloom—all of these...

  For divers, caring for the ocean is not only about what happens underwater. It also shows up in our topside habits, from what we pack in the truck, to what we carry onto the boat, to what we reach for every day between dives. One of the simplest of those choices is also one of the easiest to repeat: bringing a reusable bottle instead of buying another single-use plastic one.  That's why reusable bottles have a firm place in...