A summary of Ocean Networks Canada’s maintenance expedition in the northeast Pacific: Wiring the Abyss, Leg 2, 6-26 June 2017.

Big swells rock exploration vessel (E/V) Nautilus and cable ship (C/S) Cable Innovator during a tricky seafloor operation to lay three kilometres of cable at the Cascadia subduction zone (Figure 1). Over a kilometer below the choppy ocean surface, this fibre-optic cable connects a variety of deep sea sensors, including several accelerometers that will contribute to British Columbia’s earthquake early warning system.