My theory is that they may have built their larger shipping vessels on site while they dug. Then sailed them down the waterway to the mouth of the St Lawrence and reloaded them onto bigger vessels to ship over the Atlantic.
That is why we find no remains of any of those vessels in the great lakes.
If my theory is correct, then remains might be found someday at/around the mouth of the St Lawrence. If they survived at all. The major problem is that they had to go around Niagara Falls. The remains might be found around there.
Absolutely, Aside from the northern access, that was my thought too when I heard that idiot make that comment. Portage around the falls not possible? Of course it was, and they were master boat builders using only axes. Back to the idiotic assumption that Vikings only had sea legs and never ever could have walked across even the smallest stretch of land between waters.
That is just like the one size fits all assumption that all early man were all hydrophobic land lubbers and didn’t know how to swim or float on water craft at all. So the only way they could have possibly migrated was by land only. That is until irrefutable evidence was found to the contrary. They still now lock out the possibility of this.