Model Sailing Ship Plans

Would you ever build your own Submarine, and Dive in it?
Does anybody have the capability to build their own real submarine, and then actually dive in it. Not too long ago, three men in New York tried to make a civil war version that freaked the authorities out, thinking floating mine.
I notice there are many plans for building your own, that can handle short depths and sails. Ironically, many of the U-Boat historians have full mock plans to build anything from the late two man models to the early ship like vessels that would require a crew to operate.
Back when we were kids, I remember we tried to build a cat submarine. It didn’t work out too well. The cat scratched at the sides, and imploded it under water, at the bottom of our pool. Cat just got wet, nothing bad happen to mittens on that voyage. We also made an ant colony that survived four weeks under water, with plants for air. That was kind of cool. The seals broke apparently after water-logging or pressure finally getting to them, and they all drown.
… but only in my diseased imaginings…
I designed (term used loosely) a sailboat with submarine capabilities. I had 2 excellent reasons to do this.
1. during storms at sea, the water is supposed to be peaceful and undisturbed about 50 ft down. I got this from my very reliable dreams. Really. No, really!
2. during pirate attacks, a sailsubmarine(c) could appear to scuttle itself and continue safely some while later. I know this to be fact from my even more reliable imaginings.
If I ever get the chance, I will.
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