Just back from vacation. Did my book, pool work and test before I went and using the Universal Rererral letter did my 4 open water dives on my cruise. I did 2 beach dives in St Thomas which went very well then did 2 boat dives in Barbados. The first boat dive went very well and the 2nd one did OK till almost the end. I dont know what happened, but I floated way up and no matter how hard I tried could not get back down. I did not add any air to the BC. He said other than that I was almost perfect. It was a BLAST!