First reconnaissance at Jarvis Island, Palmyra Atoll, and Kingman Reef, Line Islands, for species diversity, community structure, deep-water habitats, and bottom topography of meso- and subphotic island slopes between 150-1027 m (mostly at 200-800 m) using Hawaii Undersea Research Laboratory (HURL) PISCES research submersibles. Data were collected during July 2005 by Bruce Mundy, Frank Parrish, and James Maragos (USFWS), with major assistance with the staff of the Hawaii Undersea Research Laboratory. Submersible dives were of 6-9 hours each: 1 at Jarvis Island, 2 at Palmyra Atoll, and 3 at Kingman Reef. Five of the dives used survey protocols from previous work in the Northwestern Hawaiian Islands, to allow comparisons with another region (one dive at Kingman Reef was purely exploratory). The protocol consisted of: (1) descent to a depth allowed by local conditions and time constraints; (2) exploratory observations upslope, (3) four 30 minute transects at 500, 450, 400, and 350 m during which observers identified, counted, and estimated the sizes of all fish and invertebrates with the aid of a calibrated laser scale projected on the substrate, and (4) more exploration upslope, if time allowed. Exploratory portions of the dives collected data on the species and habitat parameters observed, but did not include estimates of numbers or sizes of common organisms. Continuous audio and video files from the entire dives were recorded, from which data on biodiversity and habitat structure were extracted in the laboratory. Data analysis by Frank Parrish and Bruce Mundy.