Auguste Piccard (PX-8)

The Auguste Piccard mesoscaphe, also known simply as the Mésoscaphe, was a manned underwater submarine designed in 1964 by Jacques Piccard, son of Auguste Piccard. It was the world's first passenger submarine, built for Expo64, the 1964 Swiss national exhibition in Lausanne. It was built at the Giovanola fabrication plant in Monthey and the first immersion took place in Le Bouveret on 27 February 1964. It has a total of 45 Plexiglas portholes, with 20 on each side for the 40 passengers.