Upon entering H20, I found it beautifully decorated with friendly staff who evidently work hard to keep the place looking clean. They have everything you need in the change rooms--blow dryer, makeup remover, lockers with a removable key for you to bring in to your float room, etc. One thing that my boyfriend was a little uncomfortable about was the fact the change rooms are fully open and anyone could walk in and see you in your birthday suit. This didn't bother me too much but I can understand how this would be a little nerve-wracking for some people who like privacy.
After getting in and relaxing my body, I noticed a muffled, powerful noise that sounded somewhat like thunder. It stopped after about 20-25 seconds and so I just ignored it. But low and behold, 10 minutes later the rumble came again. I began to wonder where it was coming from a quickly realized it was the sound of the subway, right below!
Overall, everything was perfect aside from the location--they really dropped the ball on that one. Unfortunately I need silence to get the most out of floating so I do not think I will visit again.