Nautilus (nuclear submarine)

The nuclear submarine that inspired the model is the USS Nautilus, a nuclear attack submarine of the US Navy. It was the world's first nuclear submarine, and even those who are not familiar with the navy may have heard of it at least once.

" It is famous as a groundbreaking vessel that evolved from a 'submersible ship' to a 'true submarine', a vessel whose normal function is underwater. " (From Wikipedia)