The Sinking of the Laconia (2011)

True story set during WW2 starring Andrew Buchan, Ken Duken,
Brian Cox, Lindsay Duncan, Morven Christie.
(BBC Two - Jan 6 and 7, 2011)

Ken Duken (Werner Hartenstein)

From BBC:
"On the 12th September 1942 the Laconia - a cruise ship turned troop ship - was torpedoed and sunk by German submarine U-156 commanded by Werner Hartenstein. She carried a motley crew of women, children, wounded soldiers and Italian Prisoners of War. Having sunk the ship, Hartenstein should have left them to their uncertain fate in the water, but instead he made the incredible decision to save as many lives as he could. A true story of unexpected gallantry and humanity in the fog of war."
IMDb