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 Hi Carsten. 
What did the author (at the site you sent below) 
mean when he said ...."The subs is at this point 
made from the same tubes and the tower of windmills. This makes it a VERY solid 
shape." 
"tubes and towers of windwills"? Are windmills 
where Peter Madsen lives (Denmark) made out of thick steel tubes and towers 
sufficient as external pressure vessels for 
submarines?  
Bill.  
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