Atlantic Crossing highlights the story of a friendship forged in war... Starring Kyle MacLachlan as President Franklin Roosevelt and Sofia Helin as Norwegian Crown Princess Martha, watch the premiere Sunday, April 4 at 9/8c on MASTERPIECE. | MASTERPIECE | PBS

As Crown Princess Martha and the children began their journey to America, Norwegian sailors really did begin singing the national anthem as they discovered the royals making their departure, as seen in episode 2 of Atlantic Crossing. | MASTERPIECE | PBS