How did Niels Bohr travel from occupied Denmark to Sweden?

In the fall of 1943, the political climate in Denmark shifted significantly following the collapse of the Danish government's collaboration with German occupiers. After receiving a warning that his arrest was imminent, Niels Bohr escaped by boat with his family across the narrow sound to Sweden.1

From Stockholm, Bohr was subsequently transported to Scotland via a military airplane and then traveled to London to join the Allied atomic bomb project.1