The present invention relates to trawl doors used in trawl fishing, to seismic surveillance line spreading and spreading of other items towed in water. The present application provides a hollow trawl door, said hollow trawl door having one or more chambers and an airfoil cross-section, comprising - a first side panel (1) having a curvature forming the back surface, - a second side panel (2) having a curvature forming the front surface, and - an upper panel (3) forming the top of the trawl door and a bottom panel (4) forming the bottom of the trawl door, wherein the first side panel (1) and second side panel (2) are connected at a leading edge and at a trailing edge of the airfoil, and wherein the trawl door comprises one or more openings (5) to allow water to flow in and out of the trawl door.
