30 years ago that same company wanted to rum a pipeline beneath Puget Sound. Beside the outrage, it was pointed out that currents exceeding 4 knots pushed boulders the size of a house along groves worn in the rock. They went away.
How can a current of 4 knot push boulders the size of a house, at enough speed to damage anything? Any groove on the bottom of the Sound or Straits would have to have happened over millenia. Put in a pipeline, accomodated for moving boulders and move on. You sound like a eco-terrorist like those stopping all pipelines and drilling.
I have lived in Washington State for 70 years and never heard of this pipeline project, that was stopped because of a current pushing rocks.