soucoupe
A type of small submarine designed to hold two people.
Dr. Francis P. Shepard, Professor of Submarine Geology, who has been studying the canyons from the surface for thirty years, remarked: “I learned more in my three dives in the soucoupe.”
Where it comes from
From French soucoupe, ellipsis of soucoupe plongeante (“diving saucer”).
Adapted from the Wiktionary entry soucoupe (CC BY-SA 4.0).