I confess...

I have only just discovered that the word 'scuba' is an acronym.

To make matters worse I'm a qualified deep sea diver.

Ooops!

Hah. I had no idea.

To save anyone else the effort, google reveals it stands for "Self-Contained Underwater Breathing Apparatus"
Thank you! Glad I'm not the only one. :)

Invented by Jacques Cousteau and some other French fella, no?
Yes, Émile Gagnan.