A lost Birmingham tunnel? a piece of Birmingham Railway History ?

[horsencart]

I now think that this tunnel that has been lost ? for many years has now been found, let me explain my theory, I think that this tunnel https  https://www.flickr.com/photos/dofartshavelumps/21239279104/in/dateposted/    this is a wider view  https://www.flickr.com/photos/dofartshavelumps/21675163559/in/photostream/   is a service tunnel that was used to build the Railway tunnel that runs into New Street Station when I say "a service tunnel" what I mean is that it would have been used to get rid of the rubble that had been used to make the New Street tunnel in the first place, it would been used to send the worker up and down to the workings, I think that when the New Street tunnel had been finished it was back filled as it was not needed again, the tunnel that has been unearthed is brick built, some years later ATV studios were built on top entrance to the tunnel, I do know that the New Street tunnel runs very close to where this tunnel is, If it is not a Railway tunnel then what was it A well?

I suspect that whatever it was it may not last for to long and be filled with concrete? and be lost again so do you agree with me or have I got it wrong ?