RAID Scuba Courses RAID Open Water 20 Open Water 20 teaches you to become a confident scuba diver, qualified to explore the underwater world to a depth of 20 meters (65 feet). RAID Explorer 30 This is an exciting, fun and practical programme designed to increase your skills and understanding of the important core areas of diving. RAID Advanced 35 This course is designed to train experienced scuba divers to dive to a maximum depth of 35 metres/115 feet with no decompression.