Benthic litter and MMSW mounds. (a–g) The photos extracted from ROV video footage show examples of benthic litter accumulations observed within channels in the Messina Strait, including: bricks (a), tires, clothes and large metallic objects (b), small (c) and large (d–g) MMSW mounds, sometimes formed around large items such as a buried car (d) and a sunken boat (e). White scale bar: 20 cm. (h) Litter recovered from a dredge performed within the axis of the Messina Canyon at 1000–1100 m depth (location in Fig. 1).