Unless you carry wrenches, a bajillion ton lift sling, or a welding torch with you, we are all rec divers.
If you are being paid and other people are trusting you with their lives (even if they don't know that's what they're doing), it is not a recreation.
(IE: DMs and Instructors)
If you are treating it as such, you're doing it very, very wrong.
Flipside:
If you have paid to spend the weekend puttering around inside a shipwreck at 300FSW for 20 minutes then hang onto a rope staring at nothing for two hours, and say the words "mission objective" in reference to your recreation you sound like a tool.