Where are the service road tunnels?

Hello all.

I have just started again for the 100th time with Airport CEO :slight_smile:

But there is something I miss.
A 3/4 year ago there was still service roads tunnel.
Where are they? Do they no longer exist? Or do I have to explore them first? If so, what research project is that in?
Sorry, I really can’t find them.

Greetings Samigasi

You need to research the multiple floor permit! :slight_smile:

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