I went scuba diving with a guy once who was looking to log a large number of dives as quick as possible for a master diver challenge.
One saturday we went out to a quarry and he would go down to 20 feet and sit there for 20 minutes before coming up. Rinse and repeat.
Let's just say that if I am ever on a trip and I have the option between a dive master who has done the minimum required number of dives but they have been real dives, more than just the 20 minutes at 20 feet, I would choose them over the 20 feet for 20 minute guy any day.
200 jumps is not just a quantity of jumps, it is a quantity of experience. blog: http://www.pwlk.net/blog