New tunnel building technique

[Insertnamehere]

I see no difference between tunnels and bridges. The fact is that the more weight applied, the stronger they become. I have seen an example of an arch in Morocco built by Phoenicians over 3,000 years ago.

So the greater the weight, the better the stones fit? Then surely adhesive is not necessary. That's good news then.

I would make a projection about seismic activity on the location though, that could be a problem if it falls within such an area.