Trudy Ederle was a brave swimmer who wanted to swim across the big ocean between England and France.
Lots of men had already done it, but no woman had ever swum that far before.
Trudy worked really hard and finally did it! She was the first woman to swim across the ocean, and everyone cheered for her.
Now there's a movie about her called 'Young Woman and the Sea' where a cool actress named Daisy Ridley plays Trudy!