This made me curious about how it was that Clarence Birdseye came to discover the fast-freeze approach that preserves flavor. The answer is surprisingly straightforward - he was a fur trader in Labrador (northern Canada) and noticed when he pulled fish out they froze immediately and were still delicious months later. So if only you could make fish as cold as northern Canada, you could make frozen fish tasty! It was from there that he designed a -45F calcium chloride based belt technique and then a -25F ammonia evaporation driven technique.

https://www.loc.gov/everyday-mysteries/technology/item/who-i...