I think quite a number of professional archaeologists have gone record saying the current proposal should be rejected.
There has been an awful lot of online discussion among the archaeology community and most of what I've read hasn't been positive. There's a wide range of opinions though, some object to the particular route, length, siting of entrances etc and some to the whole idea of digging any tunnel.
I'm sure a cursory look at social media sites will provide you with particular names if you want them.
[edited for typos]