The Nautilus existed! The first submarine was found.

Nautilus (SSN-571)

Chambered Nautilus, Endless Ocean Wiki

Nautilus: What's in a Name? Proceedings - February 2001 Vol. 127

What was the first submarine to go under the North Pole? - Quora

Past present future

Sea Wonder: Chambered Nautilus National Marine Sanctuary Foundation

A history of submarines: from U-boat to Dreadnought

Nautilus submarine, aus 56% Feuerverkauf

Nautilus submarine, aus 56% Feuerverkauf

Nautilus submarine, aus 56% Feuerverkauf

Nautilus submarine, aus 56% Feuerverkauf

Nautilus - Wikipedia