Which remarkable thing did Velma Thomas of West Virginia do for 17 hours?

Velma Thomas was in cardiac arrest for 17 hours and managed to survive the event.

Her near-death experience is sometimes also known as "Lazarus Syndrome."

In 2008, Velma Thomas' heart stopped, not once, but three times. She was taken to hospital with all the symptoms of a heart attack. With no measurable brain waves, Thomas was considered clinically dead.

After being disconnected from life support, she came back to life.

https://abcnews.go.com/GMA/story?id=4923465&page=1

https://en.wikipedia.org/wiki/Lazarus_syndrome