Yes, it is possible to do the Discover Scuba Diving and try out diving without learning to swim as you are wearing a safety flotation device. If you want to become a certified scuba diver by doing the PADI Open Water Diver Course then the answer is no. In the PADI Open Water Diver Course it is specified that you have to be able to swim 200 meters with any stroke and also have to be able to tread water or float for at least 10 minutes.