Similar to the Seattle project, this one required new drilling techniques, including the use of probe holes to assess ground conditions ahead of the huge tunnel-boring machines (TBM).

Being busy means adopting tunnel vision, constantly focusing ahead, with no time to deviate, to wander, to glance at the richness and the possibilities all around you.

The paper described the relational parameters and vibration test of the underwater blasting of guide ditch ahead of water conveyance tunnel.