Laying tool for laying of submarine cable in a sea-bottom trench. The tool comprises a drag unit and a pulling tube joined by a cardanic suspension and drawn by a vessel for use under variable sea and bottom conditions. The cable is laid out from the vessel through the pulling tube, a canal in the drag unit, and, finally, into a sea-bottom trench formed by a ploughing device on the drag unit. This unit is constructed so that the cable is forced down onto the bottom of the trench even if the unit is not operating in a proper position due to a rough sea-bottom. Moreover, the drag unit is constructed so that all material turned up from the sea-bottom is pushed aside from the trench and the ploughing device. The laying tool is also provided with floating tanks adjusted so that the drag unit without cable will float but with cable it will sink. The tanks may be filled with both water and air to facilitate submergence and refloating of the drag unit.
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