NEPTUNE, otherwise known as the North-East Pacific Time-Series Underwater Networked Experiment, is relaying real-time data from the bottom of the sea to researchers and the public alike. A detailed Ars Technica profile examines the subsea infrastructure that spans 800km (about 500 miles) in length and costs non-profit organization Ocean Networks Canada $17 million a year to maintain. The article explores how NEPTUNE was assembled atop the Juan de Fuca tectonic plate and the meticulous work required to keep it fully operational. It's an intricate labor, but it ensures that 130 or so instruments attached to the network continue to provide data on everything from seismic activity to the health of the ocean.