WOW! How sad! I think this is poor, poor planning. When I did my Open Water Certificiation in Durban, South Africa from PADI it was only me and my girlfriend. When we did our 4 open water dives we were well escorted. We had our instructor, we also had a Master Diver training to be an instructor, and another rescue certified diver. All I know is that our instructor never left our sight.