This project is a collaboration between GEM Lab and the Narratives in Space+Time Society (NiS+TS). It serves as a public platform for exploring the past and present urban geography of the area surrounding the Narrows where the Halifax Explosion took place in December 1917. The tabletop consists of a semi-opaque glass projection surface representing the harbour and solid pine CNC-shaped forms for land. Projection mapping is used to project various content on the tabletop, including aerial photographs and historical maps showing the devastation caused by the explosion. Additional computer-generated content can be interactively explored using a Microsoft HoloLens head-mounted display.