Like dropping acid or flying to the moon, scuba diving is one way to leave the planet — or at least feel like you have. Humans, somehow, have learned how to temporarily become sea creatures, which seems like an exquisite prank on Mother Earth. To make sure the joke's not on you, the right equipment is crucial. That's why Aquaknots, a small, owner-operated shop just south of Miami International Airport, is the place to get started. They offer a wide range of budget and elite brands, including Sea Scuba, Sherwood, and Akona. Masks range from $50 to $100, and spear guns go for $75 to $400. Diving classes are available in both Spanish and English and are taught by an experienced instructor. Because underwater, in a blanket of darkness, you'll hear nothing but the sound of your breathing. Which sure makes the right equipment seem a matter of life and breath.