The Martina tunnel boring machine (officially named as the S-574.

[1]) is a hard rock tunnel boring machine built by Herrenknecht AG.

It is the largest hard rock tunnel boring machine in the world and has been used for drilling the Sparvo Tunnel, a part of the larger Variante di Valico project in Italy.

[1][3] The machine started work on the Sparvo tunnel in 2011, with drilling of the 2430-metre north tube completed in 2012.

The drilling of the 2600-metre south tube was finished in 2013, bringing the 5-kilometre tunneling project to an end.