[Charles Martel]

Could you imagine an American building such a thing?

Yes, I can... but we'd do it with a bit more style:

That's not just a miniature prop from a movie set - it actually submerges. There are a dozen or so *documented* privately-built minisubs. Google "manned scale submersible".

[Constitution Day]

Cool. Just like the old Disney ride 20,000 Leagues Under The Sea that no longer exists...