The NDL 40 Meter Scuba Diving Course and the PADI Advanced Open Water Diver Course are different in terms of the maximum depth they allow divers to reach. The 40 Meter NDL Scuba Diving Course offers a maximum depth of 40 meters, while the PADI Advanced Open Water Diver Course allows divers to go as deep as 30 meters. The PADI Advanced Open Water Diver Course is designed for novice divers to gain experience, improve their skills, and earn credit towards specialty certifications. The course teaches practical scuba skills and includes five adventure dives, including deep diving and underwater navigation. On the other hand, the 40 Meter NDL Scuba Diving Course requires a prerequisite of 40% specialty Nitrox Course, it is intended for experienced divers. The course includes two deep dives to a maximum depth of 40 meters over 2 Days.