Rennaker is an amazing instructor. I was in his class coming out of the Carousel 90 plus feet. When he sails by me with a big smile and no regulator!. It was a drill to see how we were doing at 90ft with the narcoses. I looked over and headed for him with my back up and he smiled again gave me an Okay sign and dropped back to my buddy never putting the reg in his mouth. My buddy never noticed his reg missing and I don't think he took a breath for 2 minutes. I would strongly suggest that this man should be in the Diver's Hall of Fame. If you can get trained by him do it before he retires. You will find none better.