Titanic's designer, Thomas Andrews marvels at the wondrous things mankind has accomplished ("In Every Age"); the RMS Titanic tops his list of things once thought impossible. Stoker Fred Barret arrives at the dock in Southampton, amazed by the feat of engineering ("How Did They Build Titanic?"). He is joined by Lookout Frederick Fleet and Wireless Telegraph Operator Harold Bride, and they gaze in awe at the "Ship of Dreams" ("There She Is") as the crew arrives. J. Bruce Ismay, Andrews and Captain E.J. Smith congratulate each other on being the owner, designer and captain of "The Largest Moving Object" in the world. The Ship's Passengers arrive; the Third and Second Class Passengers feel privileged to be aboard the maiden voyage of the Grandest Ship ever to sail ("I Must Get on that Ship"). The First Class Passengers arrive; their names and achievements are narrated by Second Class Passenger Alice Beane ("First Class Roster"). The Titanic sets sail and the assembled company wishes her a safe crossing ("Godspeed Titanic").
Now at sea, Ismay arrives on the bridge to inform Smith that he planes for the Titanic to arrive in New York on Tuesday afternoon rather Wednesday morning, while Andrews insists that the maiden voyage be a safe one. As they've cleared land, Smith allows her speed to be increased slightly. Barret, in the Boiler Room, disagrees with the order on such a new Ship, but nonetheless complies ("Barrett's Song").