I think what you are referring to is dredging in Burard Inlet to the WestCoast Transmission terminal. Currently the large tankers(can't remember the name) can only take 80% of capacity because of water depth East of Lions Gate Bridge. This has been kicked around for at least a decade. Not connected to the proposed Delta Port terminal, which is going to cause a shitstorm from the same oil spittter groups that oppose the Northern route(Pr. Rupert) In this, they have some valid points.
Apparently the port of Prince Rupert just happens to be the third deepest in the world.
The Port of Prince Rupert (located in British Columbia, Canada) ranks as the
25th busiest container port in North America. Within Canada, it is the
third busiest (behind Vancouver and Montreal).
Apparently, they're going to "dredge" the strait (I forget the name of it) so that it can accommodate larger tankers. How much is THAT going to cost?
Wanna hear weirder? I asked Google AI if America oil tankers can transit the area that bans oil takers on that portion of the B.C. coast that bans Alberta (and in turn Saskatchewan) oil and oil pipelines from tidewater?

The announcement between Ottawa and Alberta came hours after B.C. struck a deal on a multibillion-dollar federal commitment for infrastructure projects in the province and no change to the federal “Canadian import/export” tanker ban off B.C.’s North Coast.
Ms. Smith said that after studying northern and southern route options, her government determined that a pipeline from the Alberta town of Bruderheim to a deep-water port terminal on B.C.’s southwest coast offered “the fastest, most cost-effective path to expanding Canada’s energy exports”….
& the only choice not banned for “Canadian” oil for import/export on the west coast of Canada.
“Mr. Carney said the federal government will now refer the West Coast pipeline project proposal to its Major Projects Office, with consultations to begin immediately with Indigenous communities, provinces and territories. He said the government expects the decision on whether it will be a project of national interest will be made by Oct. 1. ”
Under the deal with Alberta, Carney’s government has committed to working towards designating Smith’s pipeline proposal as a project in the “national interest” by October 2026, with the stated goal of providing it with the conditions necessary to begin construction by September 2027, assuming it’s not all just hot air, smoke & mirrors, and lip service.
An Alberta-Ottawa memorandum of understanding that laid the groundwork for the pipeline plan, signed in November, said Ottawa “may” consider adjusting a prohibition on tankers loading and unloading oil along the northern B.C. coast, & then the B.C.-Ottawa MOU was signed the day of the Alberta announcement.
The plan, which sidesteps environmental concerns in B.C.’s north, calls for the new conduit to be built by federally owned Trans Mountain Corp., working with Pembina Pipeline Corp.
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