People in submarines eventually need to sit down, and in 1944 aluminum company ALCOA collaborated with the U.S. Navy on the purpose-built 1006 Chair, also known as the Navy Chair or Submarine Chair. The design brief had at least one interesting bulletpoint: The chair had to be “torpedo-proof.”
The resultant super-strong chair is still in production today, manufactured by aluminum chair company Emeco. For a fascinating look at how it’s made, check out their 77-step process, starting from aluminum sheets and ending up with the finished product:
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Source: core77