The person undergoing the NDE may feel a sensation of being dead and having out-of-body experiences, and typically reports going through a tunnel and seeing a light at the end. While these near-death experiences might seem very real to those who report them, science does not support them as anything more than hallucinations brought on by panic, medication side effects, or oxygen deprivation.
This episode is also available as a blog post: https://ubuntuvillageusa.org/2022/09/24/why-near-death-experiences-cant-be-explained-away/