The question of where we go after we have died has been one of humanity's greatest mysteries for centuries.
One man who claims to know the answer or at least has an inclination of what might happen is the brain surgeon, Dr Eben Alexander.
In 2008, Alexander fell into a week-long coma and has documented what he can remember from this event in a new book called Living in aMindful Universe: A Neurosurgeon's Journey Into the Heart of Consciousness.
In the book Alexander claims to have experienced a sensation that felt like he was ascending to the heavens or something of that equivalent.
At the time he was suffering from a brain infection known as meningoencephalitis, which left him at two per cent chance of staying alive.
Even doctors told his family that he was about to die and was placed on a medical ventilator to preserve him for a little longer.
It is at that point that he began to experience unusual activity.
The 63-year-old reportedly says that a light came down from above and he began to hear music.