The first and till this day largest built submarine for tourism purposes, and also the largest non-military submarine. The Swiss oceanographer Jacques Piccard built it for the Swiss National Exhibition in 1964. Model in the Swiss museum of transportation in Lucerne, Switzerland, Nov 3, 2014. (1/15)
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/70981241@N00">Kecko</a> from Switzerland (Rheintal SG)
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/kecko/15722856966/">PX-8 Mésoscaphe - Swiss Submarine</a>