Daz
A mate of mine has had the op for this and he still dives. He is also a diving doc (in a professional caspacity as opposed to a doc who dives).
However given one of his nicknames is Doc Savage, I wouldn't take that as a recommendation for the all clear
.
I'll ask him his views (in a hypothetical situation type of way). Although it may come back as a "do as I say and not as I do" situation.
Snash