I love it! 75 feet high and 2 full time divers... Hmmm, if I remember correctly, full time? means 40 hours. The average bottom time on the first dive is somewhere around 30-40 minutes (don't have my dive tables handy) On nitrox, you get more, but still not all day! Then again, some of their time is spent higher up... with a good dive computer they may be able to do better. Wonder how that works?