Doubles work well down to 350 ft. Deeper than this and you would be in CCR country. Shallower than this and a CCR is definitely inappropriate, unless you are filming videos professionally. And even then, you would want somebody with twin tanks watching your every move. Particularly if you stop moving!
Are you telling me I should sell my CCR? Because I use it for shallower dives?
This is a joke, right?
Mania
PS. Sorry for the off topic again but it just made me wondering
