StreetDoctor
Contributor
Second, a class involving double cylinders, manifold valves, canister lights and jet fins is a good distance from the typical discussion about how many dives to accomplish between OW and AOW and who makes the prettiest neon accented jacket BCD. But of course I have been wrong often lately.
Who ever said you have to take the course in doubles? I don't think you understand the concept of Fundamentals