This 14-day ONC-led expedition (September 5-19, 2023) took place onboard the Canadian Coast Guard Vessel John P. Tully. Our team from ONC and Pelagic Research Services maintained and installed infrastructure and instrumentation at ONC’s NEPTUNE observatory located off the west coast of Vancouver Island. Pelagic’s remotely operated vehicle (ROV) Odysseus dove to depths of up to 2,600 metres, recovering and deploying equipment that enables continuous, ocean data to keep flowing from NEPTUNE to the open-access data portal, Oceans 3.0.