Classes Offered at Matthews Water Sports Whether you are just looking to start your diving dream or you have been diving for years and just need a refresher, the staff at Matthews Water Sports can help you out. We don't just teach you how to dive but how to be a safe, responsible diver and open a whole new world up to you. The earth is over 2/3 water; find out what you are missing. To learn about the SSI classes we offer, select one of the documents below. If you have any questions, please feel free to give us a call or send us an email. Open Water Diver Advanced Open Water Diver Stress And Rescue Nitrox Skills Update Dive Control Specialist Come by the Shop and ask for details on how you can take part in the SSI Master Diver Challenge.