The Journal of Fish Biology has published a paper listing 5 observations of oarfish (Regalecus glesne) that were filmed or recorded by deep diving remotely operated vehicles (ROV). Previously, the species had only been observed either dead or dying at the surface. The ROV that recorded the sightings was diving as a part of the SERPENT project, a collaboration between the oil and gas industries and scientists and was carrying out seafloor and water column biotic surveys as a part of the Deepwater Horizon oil spill damage assessment. The oarfish were encountered in the epipelagic (0-200m) and mesopelagic (200m-1,000m) zones.