  Published: August 03, 1993  AS a boy growing up in London in
the early 1950's, then as a young engineer, Graham Hawkes often
regretted having been born too late to join the machine-shop
daredevils who flew into the sky on a shoestring and, almost as
an afterthought, founded the aviation industry.  That melancholy
gave way as Mr. Hawkes discovered the challenge of the emerging
field of undersea engineering. His pioneering ideas soon made
him one of the world's top designers of diving suits, submarines
and undersea robots and helped him start a number of successful
companies.  Here at a marina on San Francisco Bay, his 40-foot
sailboat and black Corvette nearby, he is now embarked on a
venture that for the first time joins his love of flight with
his vision of the deep. If he is successful, his new vehicle
will take him into the inky blackness of the ocean's deepest
canyon, nearly seven miles down, his latest foray in a long
effort to fathom the planet's last frontier.  The machine coming
into existence here