 "Advanced", "Overhead" or "Cave/Wreck" sidemount is the highest level of sidemount training which develops skills specifically for demanding penetration dives in the overhead cave or wreck environment.These courses are focused on maximizing the benefits of sidemount for passage through restricted and confined areas; and also teach multiple stage (additional tanks of bottom gas) diving techniques.Access to courses at this level is typically reserved for fully qualified cave or technical wreck sidemount divers, who have significant experience and skill.