I think the depth limits get misinterpreted by many instructors and then that gets passed on to the students. The depth limits PADI imposes are for training dives and are standards for the instructor to follow. The only depth limit they try to impose after OW certification is age based and states for 10 and 11 year olds "After Certification - Must dive with a parent/guardian or PADI Professional to 12 meters/40 feet maximum depth" plug for them. As stated in the manual OW dives 1 and 2 - 12 meters/40 feet, OW dives 3 and 4 - 18 meters/60 feet or when conducting three dives in one day the maximum depth for the last dive is 12 meters/40 feet. Again these are max depths for training dives but the accepted recreational depth is 130 feet.