After Doyle exposes Mark's past, Mark sets out on a secret quest. When a collision sends the RMS Olympic back to the shipyard, Mark must study the implications of the wreck from the view of the Titanic's metallurgy.

Cast: Kevin Zegers, Alessandra Mastronardi, Derek Jacobi, Billy Carter, Massimo Ghini, Branwell Donaghey, Martin McCann, Ophelia Lovibond, Gray O'Brien, Ian McElhinney, Valentina Corti, Denise Gough, Jonathan Forbes, Edoardo Leo, Frank McCusker