Don will be leading this two day Technical Class. First Course using a Helium Mixture - Dives are to 200’ using 2 stage bottles. Graduates are able to make dives requiring long decompression stops and needing expedition quality contingency plans. They are comfortable making advanced equipment selection and know how to configure and manage additional gear to function well on long dives in local conditions. This gear will include two sling / stage cylinders containing decompression gases. They also fully understand water behaviors dictated by use of helium in breathing mixes; are competent using complex gas management calculations and have the ability to create, manage and modify complex decompression schedules and apply them as appropriate to the dive conditions. Graduates should also be familiar with the correct procedures for using a helium / oxygen analyzer to test mixes. This is a two day class and consists of 4 dives. Cost of this class is $900 and includes books, course material, registration and ALL GASES. Prerequisites for this course are: 18 years old. Advanced Nitrox / Decompression certified (or equivalent). 100 logged dives.