NE Atlantic dump zone, ~1,200 km off the Bay of Biscay

First NODSSUM campaign (wide-area survey tier): the AUV Ulyx — on its first scientific deployment — flew lawnmower tracks over the abyssal plain at ~6 m above the seabed, acquiring high-resolution imagery assembled into georeferenced mosaics. The survey covered a 14,500 km² dump zone at depths >4,700 m, locating 3,355 individual drums and producing the target list for the planned 2026 crewed/ROV close-inspection campaign. Approximately 50 drums were observed at close range during this first tier, providing initial direct observations before the dedicated inspection phase.