Given that Tesla uses double paned glass for acoustic reasons, one of the perhaps unintended consequences is that it is even tougher to break. This stuff will never be broken underwater with a hammer... I know one thing and that is I’d like to see it demonstrated as to what device will break it.
Have a look at this link and don’t miss the comment by ‘Hoodoo Texas’ about 3/4 of the way down the page....
Oooh. Seems a good reason not to get a Tesla especially if you live near water.