This report was written by Michel Barbet during a training: "Meg End User Course". ISC (Innerspace Systems Corporation) provides this training to any Megalodon rebreather user who wishes to know his/her machine in depth. Michel spent eight full days in ISC Centralia, WA United States. During this training, the trainee is required to totally assemble several machines (APECS and Shearwater versions) under the active, efficient and attentive surveillance of the Chief Engineer, who knows his machines like the back of his hands...