“I went down a tunnel, I saw a light.” It has become such a standard part of near-death-experience accounts that it’s almost a cliché. Near-death experiencers report moving through a (usually dark) tunnel and emerging at a different place, where they may encounter a being of light, deceased relatives, heavenly landscapes, a review of their lives—usually some combination, or all, of those elements.
The tunnel experience is common though not universal. Some NDErs seem to go directly to the other world, without passing through a tunnel. Tunnels seem to be considerably less common in Hindu NDEs. Japanese NDErs report moving along rivers instead of tunnels.
At least in Western NDEs, though, tunnels are more common in cases where NDErs are actually clinically dead. All this suggests that the tunnel is a metaphorical representation of the transition from one world to the other. What is, however, universal is that the world encountered in the NDE is very different from the earthly one—and in the vast majority of cases, a lot better. To such an extent that NDErs—no matter what their earthly responsibilities and attachments—usually want to stay in the transcendent world, and regret—sometimes quite painfully—having to return to the earthly one.