Almost looks like the tunnel I stood in one time during conscious travel. The tunnel is the inside of the silver cord often noted in astral projecting. Inside of the tunnel all surroundings were very dark with beautiful bright light in the distant center. If I would have moved into that tunnel, I would have made it into Nirvana (a.k.a. Heaven), the pit-stop station house between missionary Earth and star gates (e.g. Sirius A).