Submarines have got to be one of the coolest inventions of all times, and having an hobby that involves submarines is pretty awesome. Now, I can't even begin to image the amount of work that would go into making a sub on your own. I can only assume it'd be a monumental effort for a hobbyist. Damn if you don't kill yourself trying the thing out.
This impressive underwater vehicle was built by a man living in St-Petersburg, Russia. It is officially registered as the smallest submarine in the country and what is most impressive is that it can travel underwater from St-Petersburg to Helsinky and back, without having to make any stops.
This one man, home-made submarine reaches a top-speed of four knots. Not bad!
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