The Mountains in the Deep Expedition (EX1705), conducted from April 27, 2017, to May 19, 2017, onboard NOAA Ship Okeanos Explorer, collected valuable new information to support management and science needs throughout the Central Pacific Basin. Operations were conducted in American Samoa and the National Marine Sanctuary of American Samoa, the Cook Islands’ Marae Moana marine park, and in the Jarvis Island and Palmyra Atoll and Kingman Reef Units of the Pacific Remote Islands Marine National Monument (PRIMNM as part of the Campaign to Address Pacific monument Science, Technology, and Ocean NEeds (CAPSTONE).