The only other "water work" is a snorkeling dive. I just went through their standards book yesterday and have been on many outings where SSI open water classes were being performed. They snorkel around the boat and dive down to the bottom once, while the instructor indirectly supervises. We did the same thing but it is optional. I have not yet researched the other programs because in our area, there are two and only two choices, PADI and SSI. Then again, I have seen YMCA programs where class and confined water are 2 days, such as an ad from Mick's Scuba in Fargo for Feb. 24 and 25. All YMCA instructors must not include the large number of hours required by Walter. We do 10 hours classroom and 8 to 12 hours pool, plus remedial.Thalassamania:You're comparing the two most rigid systems, so that's expected, except I think you get more water work with SSI.