Tunnelling is the process of building wormholes between two distant parts of space. This requires a ship with an ambi-powered bore that can punch through subspace in order to create the tunnel. A Sianat Pair is also needed to navigate within subspace. Since tunnelling ships must often travel to the far end of the planned route in order to perform the punch, they often make long-haul trips.

Tunnelling jobs are classed into three levels, with Level Three being the smallest tunnels and Level One the largest. The bores for larger tunnels are more expensive, and can only be afforded by the most successful ships.

Tunnelling is the main business of the Wayfarer and its crew.