Any scuba divers on board with GAG?

Do you know what this signal means and when you give it?

BTY, Im crazy for her beautiful blue eyes!
BTY, I'm crazy for her beautiful blue eyes!

She is a photog/model for a popular diving magazine, and for those 'divers' reading, what kind of 'breathing apparatus is she using? She is not wearing the typical compressed air tank and regulator. A 'diver' would recognize the configuration she is breathing through

Any scuba divers on board with GAG?
Post Opinion