1963 ~ The American submarine USS Thresher and its crew was lost off Cape Cod, Mass.

It was a harsh way to discover the max allowable depth for the hull type.

The sub loss was confirmed by the Trieste, the bathyscaphe Piccard and Walsh took to the bottom of the Marianas Trench.

The reactor was never recovered, a ticking ecological disaster.

As the lead ship of her class, all further subs of her pattern should have been "Thresher Class", but rather than name them for a sunken ship (unlucky), the class was named for the second hull, USS Permit.

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Calm, quiet, smooth, devastating