Personally, I've always been terrified of submarines and just about everything associated with them (perhaps it's the periscope). But after looking through these 20 strapping submarines, I found them to be tough, ingenious and interesting.
For a deep diving adventure take a look at these 20 strapping submarines.
12 Strapping Submarines
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From Luxury Diving Yachts to Steampunked Subs
Published: Aug 7, 2009 Updated: Mar 24 2011