According to Osho, yes—there is an inner ‘line of light’: a living link between soul and body centered at the navel. The navel is the original portal of life: physically, through the umbilical cord, and inwardly, where the soul’s life-force enters. If this subtle connection breaks, returning to this body is impossible.
There’s a life-connection like a light-string at your belly button that ties your soul to your body.