Ocean Networks Canada (ONC) and its global partners have designed two major engineering advancements to support the eventual creation of the Pacific Ocean Neutrino Experiment (P-ONE) telescope; starting with planned deployment of the first one-kilometre mooring off the coast of British Columbia during an expedition later this year. The multi-partner [P-ONE project](https://www.pacific-neutrino.org) aims to eventually deploy approximately 70 one-kilometer-tall moorings, spaced 80 metres apart, and equipped with scientific instruments extending up from the seafloor. P-ONE will be plugged into ONC’s NEPTUNE observatory, using the pre-existing subsea network to transform vast stretches of deep ocean into a massive particle detector. “ONC plays a critical role in P-ONE,” says A.J. Baron, a senior mechanical engineer and field manager at ONC. “We are responsible for ensuring that the instrumentation and the scientists have what they need for power, for communications, and for extremely precise timing.” ONC engineers, with support from P-ONE collaborators from Canada, Europe, United Kingdom and the United States, designed and manufactured a custom deployment frame and a project-specific string junction box (sJB) to make it easier to precisely place and power the one-kilometer-tall moorings at a depth of over 2,600 meters on the seafloor. There they will provide continuous monitoring to detect the abundant, but elusive neutrinos that pass through Earth.