Snuba is a very restrictive form of scuba where you are connected via. a long hose to a compressor floating around on the surface. It doesn't have a good safety record because non-SCUBA trained people have done it without proper instruction because it looks so easy.
I would guarantee that Protech would run everything correctly -what I do not understand is why people would prefer this to Scuba which is IMO easier and allows more freedom underwater.
It might be better for people with dietary problems who do not consider 70+lbs overweight - they consider themselves "cute and cuddly" - because with SNUBA they don't have that heavy tank on their back when they're getting out of the water.