Ian,
Interesting that your expert finds the method here risk-free, only because of the short video and without knowing a geological map. Less nice, however, is the insulting way of answering which you on top also repeat twice. Thanks very much.
When I spoke of a" Greek method", I meant that it was a Greek company that got the order for the construction of the motorway and tunnel and not, for example, a Cypriot one.
In fact, the Greek company got the job after their offer was around 86 million euros, in contrast to the Cypriots who asked around 300 million euros.
So I mentioned it would be much cheaper for them to do the tunneling with an excavator instead of using professional drilling equipment, however it takes long time until they will be finished as in 24 hours they only gain 2 meters. (source: Pafos Live)
I personally use a geological map every time before I start a job to find water for a well, which is also helpful for the contractor.
As far as the current tunnel drilling is concerned, it looks like the route is in the so-called Pakhna formation, which includes alternating chalks, marls, marly chalks, chalky marls and arenites.
Attached a screen shot from Geological map of the area which i marked purple where the tunnel is going. Black broken line nearby is a fault line which shows why the largest earthquake in Cyprus in 1953 (6,0 Richter)was in Stroumpi. Hopefully there are no tremors while they are still working on the tunnel.
Max