Wrecks over 100 years old and archaeological objects found underwater are protected under the National Monuments (Amendment) Acts 1987 and 1994. Significant wrecks less that 100 years old can be designated by Underwater Heritage Order (UHO) on account of their historical, archaeological or artistic importance as is the case with the wreck of the RMS Lusitania lost off the Old Head of Kinsale in 1915. UHOs can also be used to designate areas of seabed or land covered by water to more clearly define and protect wreck sites and archaeological objects . https://www.archaeology.ie/underwater-archaeology
The tragic story of the sinking of the Lusitania, in May 1915, has been well documented in publications such as :
The Lusitania, Unravelling the Mysteries, by Patrick O'Sullivan (2003)
Exploring the Lusitania by Robert D.Ballard, with Spencer Dunmore (1995)
Lusitania, An Epic Tragedy , by Diana Preston (2002)
A myriad of journals, websites and forums deal with the Lusitania tragedy and the controversies . Any expansion on these is beyond the scope of this site.
This page features a small collection of contemporary postcards and ephemera, most published just after the event, or immediately postwar. The First Wold War was the first time that the power of mass propaganda was used to it's fullest extent. The postcard, was the social media and e-mail of of the era, cheap, with instantly visible impact. It was a potent propaganda tool.