People who have come back from being legally declared dead. what was your experience

my friend told me that one his friend uncles was in a car crash not in a bad one but it did send his uncle flying it hit his head and there was alot of blood people thought he was dead but after like a few hours in the doctor he just opened his eyes but still couldnt move

the electromagnetic spectrum includes, from longest wavelength to shortest: radio waves, microwaves, infrared, optical, ultraviolet, x-rays, and gamma-rays.