Another teen that has built a submarine is Håkan Lans (http://en.wikipedia.org/wiki/H%C3%A5kan_Lans http://en.wikipedia.org/wiki/H%C3%A5kan_Lans). He built a su

Another teen that has built a submarine is Håkan Lans (http://en.wikipedia.org/wiki/H%C3%A5kan_Lans http://en.wikipedia.org/wiki/H%C3%A5kan_Lans). He built a submarine that took him close to 100 m deep (I find different sources, 90 - 110 m). This was in 1968 while he was 18-19 years old. He subsequently was drafted to FOA, the Swedish defense research institute, and is probably the most famous (to Swedes in general) now living Swedish inventor.