The invention relates to a device (1) for removing a material (4) welling out from the seabed (2), said device having an outer casing (6) and a tubular guide device (10) that has a longitudinal direction, a later surface and a plurality of segments (12) that can be moved into an open position and a closed position. The lateral surface is closed in the closed position of the segments (12), and therefore the guide device (10) allows a flow of the material (4) only along the longitudinal direction, and the lateral surface has at least one opening in the opening position of the segments (12).