On Sat, Aug 18, 2018, 10:53 AM Phil Koontz  wrote:

> I have been wandering through the list archives looking for the story of
> the HY-80 Submarine-Hull-anvil, finding only some vague references and
> broken links to pictures
>

This has a bit of the story and a working picture.
https://www.georgesbasement.com/fs2101a.htm