Titanic Blood and Steel Under Lock and Key Episode 5

Mark's story is fully revealed. When he lived in Belfast, he had a girlfriend, named Siobhan Doyle. She was supposed to follow him to America but never did. Siobhan died soon after. Mark's father told him she had died of TB. Instead, she had died at childbirth without him ever knowing. Mark realises how much Siobhan suffered, and is heartbroken. She was sent to a convent. Mark confronts Sean, who insists that he lied because he didn't want his son giving up his own new life in America, and he insists Siobhan didn't want that either, so she did not contact him. Mark angrily turns his back on his father, and visits the convent where Siobhan is buried. To his utter shock, he finds out that the child, a baby girl, survived and was handed over to the church for adoption. He tries to find her, but the nuns will not tell him anything. An accident occurs that forces him back to work: RMS Olympic, a ship in the same class as Titanic, has had a serious accident. Mark is asked to study the implications. Mark's new discoveries are now less important that delivering on schedule. Meanwhile, Pirrie and Andrews discover Mark's true identity and that he is Catholic, but sympathetic to him, they guard his secret.

Original airdate on June 10, 2012