@AusOcean if you think about it because there is no need for an airspace and can be filled with any non-conductive liquid and thus be capable of any depth it really becomes rather trivial. Its only human subs where we need air pockets where depth is a challenge.

@freemo You're hired!! 😂 Design one for us 😀 This does make sense though, our underwater cameras are filled with mineral oil 🎥