I don't know.
Google asks why I "misspelled" bathyscaph, preferring instead bathyscaph
e, which then returned 700% more references. Internet dictionaries battle between introducing new "commonly misspelled" words as the "correct" spelling.
I always check my 54-year-old
American College Dictionary*. There is no entry for either bathyscape, bathyscaph,
or bathyscaphe. They reference bathy
sphere, which suggests that
bathyscape, bathyscaph, or bathyscaphe are post-SCUBA inventions. (Cousteau worked on SCUBA at the end of WWII).
According to Google, Cousteau's own saucer was named "Denise", and is much sleeker, fancier, and faster (15 KPH+) than RG's could ever have been.
Like Grant, I had a teenager's plans for a Winnipesaukee submersible. (And still have the blueprints).
RG's submersible is far more sophisticated than my design, which was made of welded flat steel plates and which required a pair of snorkels: One for intake (air for the operators), and an exhaust doubling to rid CO2
and the exhaust for the lawnmower engine that provided propulsion. No reverse. It needs a diver's flag now, too.
*(That 1951 dictionary does not have an entry for "raunchy" -- what times those must have been!)