I have used these Float Arms on Approximately 50 Dives to Help keep my GH5 or Black Magic 4 K underwater housing buoyed up somewhat. 
Recently on a nice Labor Day outing with my fellow divers from Hollywood Divers., I decided to play around with the Floodable Arm and my old Go Pro 7 
Experimentation with Buouancy and Camera Horizontal trim have become more of a priority over the last few divers. You can practice with the Kraken Floodable float arm. Get it at Hollywooddivers
