TDI Extended Range      Again a comprehensive five day course, with 100 minutes bottom time required to qualify. The course concentrates on the proper techniques, equipment requirements, and hazards of deep air (55 metres maximum) utilising nitrox and oxygen for accelerated decompression. The course places a great deal of emphasis on personal and team limits, shut down procedures, gas switching, DSMB deployment and contingency planning etc. Pre-requisites: Advanced Nitrox Diver and Decompression Procedures Diver or equivalent, 100 logged dives, of which 25 must be deeper than 30 msw. Minimum 18 years of age.