A couple of fellas in N. Nevada made an underwater bubble structure in a lake near their house and now are considering making and selling a retail product.
IMO this has lawsuit/death trap/gene pool cleansing all over it. It's gotten a moderate amount of media attention. They anchored it with stainless cables to boulders. They are also thinking of making a swimming pool version. How the hell are they going to keep that submerged? A ton or two of lead?