Links to photographs of AMC Laurentic:
SS Laurentic (1908)is on Wikipedia (dark livery) scroll down page to AMC section. On looking at the photo again today I would say it is Black hull and dark grey upperworks with grey funnel.
The Laurentic Legacy. https://laurentic memorial.com Light grey photograph full width immediately under header on opening page.
The wreck is owned by a Derry-based diver; Ray Cossum