Hi,
After reading this post, I pulled this video out tonight to watch it. My wife bought it for me at least a decade ago. It's called "Alpine Tunnel - The Inside Story". It was made by:
Historical Video Productions
6309 W Milden Lane, West Valley City,
Utah 84120-6919
The movie is a little amatuerish in production, but the video of the inside of the tunnel is priceless. The exploration took place in August 1992 and they tried again in October 1992 but the tunnel was blocked. I particularly like the cheesy music ("Forever Young" by Alphaville).
There is a nice little diagram that comes with the video showing what they found in the tunnel.
Craig.