Florida’s Triton has been making high-end civilian submarines for more than a decade now, dividing its sales between scientific explorers, commercial and cinematography clients, and ultra-rich superyacht owners looking to spruce up their wet garages with something more interesting than a jet ski.

The key to Triton’s market dominance has been its mastery of the acrylic sphere. Its bubble-subs give drivers and passengers an ultra-widescreen panoramic view of the world under the water, totally free from optical distortion…