I read a book on submarine construction not that long ago, but it was based on the Electric Boat Company which builds modern US submarines, and the welding required is incredibly difficult and their quality control is extremely high as are their inspections of current boats whenever they come back from patrol.
The last thing you want is to have a seam pop when you're at 500 feet.
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My name is Ozymandias, King of Kings;
Look on my Works, ye Mighty, and despair!
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