I have posted several videos of it on YouTube and am in the process of making my own dive helmet.
Here are the links to my Aqua Bell helmet videos on YouTube and a playlist of related videos. Included below at the very bottom are scans of the literature and dive instructions which came with the Aquabell as several people have asked me for them.
Aquabell Dive helmet & underwater videos Playlist
Testing my 1976 Aqua Bell dive helmet in a pool
Robb's $49 (1976) Aqua Bell Dive Helmet
Home page link
ROBB MOFFETT's Ramblings ,Inventions & DIY Adventures
Scans of Aqua bell literature and dive instructions.