Steve, I've been doing two tri-mix dives a day, and teach this as well. Unfortunately our deeper dive sites require a 6-15 hour boat ride (one way), so two diver are quite common on the same day. I've used Tables by Crea and Hamilton, and more recently (the past three years) have been using Decom and Pro-Planner, all with no incident. Dives range between 200-250 feet, on average a 25-30 minute bottom time with a 4 hour surface interval, followed by a repet dive that is usually 5 minutes shorter than the first. Safe Diving, Raimo. May 8, 1996 7:04 am
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