The history is complicated for Tunnel Hunt too, not just for Vertigo. "Tunnel Hunt" was resurrected and killed multiple times by Atari with the same name but slightly different HW and code each time, and one of those times (sometime before the vector->raster adaptation but after Tube Chase - http://mamedev.emulab.it/undumped/index.php?title=Tube_Chase_%28Prototype%29) it went to Exidy from Atari, Exidy tested it and eventually did not release it. Later Exidy made a second Vertigo, and the two Vertigo's aren't related other than in that they're both vector games, have the same name, similar but not identical logos, and both were not released.
I'm not sure why MAME says 1979 when the Atari version never saw actual release. Maybe that is the date of that particular raster prototype before they turned it over to Centuri later.