The Irish Sea that separates Great Britain and Ireland has often been written about in terms of divisions, threats, and hazards. Facing each other across that sea, the coasts of Wales and Ireland’s eastern seaboard have a more complex story to tell, one characterised by intimate if troubled lines of connection. Through the case study of the sinking of the RMS <i>Leinster</i> on 10 October 1918, we argue that the Irish Sea is defined not only by the coasts that encapsulate it, its ecologies and biodiversity, or the maritime routes that crisscross its surface, but by the lives, vessels, and material objects lost at sea.
