Israel may already be using these things, now they’re going public by telling us they’re going to develop them.
We didn’t know that Hizbollah’s leader, Nasrallah, swims in a Mickey Mouse bathing suit just off of Beirut’s public beaches...of course the color scheme of his suit is green and yellow.
And of course, if a ships interior is not a bubble of air but whatever you want it to be, diving is different and you’d be equally at home deep in the marianas trench. Unfindable.