In October 2024, Hannah performed a semi-improvisational sound-piece in the diversion tunnel at the foot of Hydro Tasmania’s Gordon Dam – a tunnel carved into the natural cliff face that lines the river’s edge, to redirect its flow during the construction of the wall. Standing before the tunnel’s plug, in the pooling dam leakage water, Hannah performed with a site-specific waterphone, responding to the sounds of the site, guided by a loose score of hydropower and environmental data.

Brass rods, played with bow and mallet, sonify data of the Gordon River’s flow - prior to, and after, the dam’s construction. Inside the body of the instrument, a small amount of Lake Gordon water conjures pre-echoes and bends the resonant frequencies. Through industrial metallic percussion, and haunting watery calls, the performance explores historic and ongoing intervention with the river, and its electrical legacies which stretch across the island. A gesture to channel the contained body of water (ghost of past futures), as a performative conduit between both sides of the wall, tracing the water’s former pathway, and revealing (sonic and spatiotemporal) resonances between the past and present.

The performance marked the 50th anniversary year of the Gordon Dam’s construction.