© GettyA website dedicated to sharing survivors' near-death experience stories has revealed some incredible claims about the afterlife.
Of course, the trouble is that the only people who know for sure are all dead... so they aren't much help when it comes to filling in the gaps.
But what about the people who die and then come back to life - as part of a near-death experience?
One website, the Near Death Experience Research Foundation, has made it its mission to collect the stories of people who came close to the brink - but lived to tell the tale.
On the site, alleged survivors have shared a host of incredible stories about what the afterlife is really like, with some amazing claims about life after death.
Some of the firsthand accounts are chilling, like the story of the person who claimed they experienced a vision of hell during a suicide attempt.
They said: "I remember feeling terrified. It was so dark and I could not see anything below me, so it was hard to figure out what was going on.
"As the Beings pulled me into their midst, it seemed squishy and wet, as well as dark and cold. Meanwhile, the Beings all around me were ripping and tearing at me.
"I was thinking that I didn't like this at all and wanted to go back."
Another sinister experience came from a Czech woman who reportedly had a near-death experience due to pneumonia.
The woman, named only as Hana P, said: "I had a vision of a grey area with many scattered boards and beams.
"At the top right is a circular light, which had an incredibly bright centre that was inviting me to enter. Suddenly I realised with horror that it was the transition between life and death.
"I said, 'I do not want to enter. I have not tried everything in my life.'"
But not every story was so unsettling.
Most near-death experience survivors reported a feeling of calm, peace and warmth as they are bathed in a bright light.
A man identified as Richard L shared a recent experience which took place after a seizure two months ago.
He said: "I felt no pain. I felt an unending love and a sense of peace as I kept floating towards the light."
Many accounts of the afterlife overlap, with repeated references to a bright light and euphoric feeling - as well as a tunnel.
Alexander S, who reportedly nearly died after being attacked, said: "I saw a very bright light almost like at the end of a tunnel. It made me so warm and happy.
"I could just the see clouds and then I heard voices in the background."
And heart-attack survivor Tom B said: " I felt very relaxed and peaceful. Everything was black and I had the feeling of being in a tunnel. Way off, in the distance at the end of the tunnel, I could see a bright light."
Meanwhile, Heidi C's account of her near-death experience after a heart attack echoes many of these accounts.
She said: "The light was the most beautiful white, golden light. I felt immense happiness, contentment, peace, warmth and love.
"The light was bubbly, sparkling and effervescent, like champagne. There are no words to really express or articulate how I felt or to describe the beautiful light and warmth that I was bathed in.
"The colours and feelings were a million times magnified."
Previously, we told how a man who had a near-death experience explained what happens to good and bad people after they die... from "fear and darkness" to "a tunnel of light."
We also told how a top British scientist claimed that we all have souls which can live on after our bodies die.
I have been reading articles on SOTT that discuss the concept of 'sin' and how it is attributed to the 'Old Testament'. I disagree; Zoroastrianism was an early predecessor of the Old Testament and the concept of good and evil was the foundation of that belief system. Similarly, we really don't have written records for ancient societies that related deeds on Earth to consequences after death.