Sediment trap samples from the shelf edge area (400-450m water depth), 58km northeast of the failed Macondo well, were collected before, during and after the Deepwater Horizon oil spill. Detailed chemical analyses of particulates revealed that fluxes of spill-derived TPH (2356μg/m2/day), total PAH (5.4μg/m2/day), and hopane (0.89μg/m2/day) settling to the seafloor directly beneath the surface-plume were 19- to 44-times higher during the active spill than pre- and post-spill background values. The oil was variably biodegraded, evaporated and photo-oxidized indicating that it derived from the sinking of surface oil. The hopane-based oil flux that we calculate (10bbl/km2) indicates that at least 76,000bbl of Macondo oil that reached the ocean surface subsequently sank over an area of approximately 7600km2. We explore how this flux of sunken surface oil contributed to the total volume of oil deposited on the seafloor following the Deepwater Horizon incident. •Marine oil snow sank from the sea surface during the Deepwater Horizon oil spill.•~10bbl/km2 of oil was deposited in the VK826 area during the active spill.•>76,000bbl of oil once at/near the surface sank over ~7600km2 of the GoM.•At least 7% of all unrecovered/unburned oil released (3.19Mbbl) reached the seafloor.