Tunnel boring machine ‘Harriet Brooks’ has arrived

In June, the 6.97-metre-diameter Tunnel Boring Machine (TBM), named Harriet Brooks after Canada's first nuclear physicist and associated with the Darlington New Nuclear Project’s Condenser Cooling Water work, arrived at the Port of Oshawa from the Netherlands.

After clearing customs and inspections, Harriet Brooks was unloaded before travelling in 15 carefully coordinated shipments to the DNNP site.

Harriet Brooks will now be stored on the project site until assembly begins in early 2026. When operational, the TBM will bore and line the 3.4-kilometre-long Condenser Cooling Water tunnel—an essential element for bringing Canada’s first grid-scale small modular reactor online.

Learn more about Harriet Brooks and other recent project developments.