What did Roald Amundsen find on his journey to find the Northwest Passage?

The Gjoa Expedition, led by Amundsen, indeed found a passage by way of the 'Baffin Bay, the Parry Channel and then south through Peel Sound, James Ross Strait, Simpson Strait and Rae Strait'.

Because their ship had a shallow draft -- the route they took proved not to be a commercial route.