TDI Extended Range Diver Certain areas of the world provide spectacular dives at depths deeper than 39m/130 feet but you will not have access (or very limited access) to helium. The TDI Extended Range course teaches you the proper techniques for utilizing compressed air as a breathing gas and with a maximum depth of 55m/180 feet you won’t have to miss those dives. The Extended Range course will cover topics and skills such as Equipment requirements and configuration Decompression options Use of surface marker buoys Buddy rescue Narcosis checks and management Materials for this course include the TDI Extended Range Diving Manual. Course price includes the Extended Range Diver Manual and Certification Price: £450.00 (Including VAT at 20%) Quantity: