There's no regulator, so the thingy on her back is completely useless. Scuba divers don't normally even wear snorkels while scuba diving, because they have regulators.
Haha. It's fine, I don't expect you to know the details of scuba gear XD I, on the other hand, spent the better part of yesterday 85 feet underwater, so I know a thing or two about what I'm talking about