On 10th February tracks were damaged at Havant, Rye, Winchelsea and Pevensey. Normal working was restored by the morning of 12th February. On 16th/17th February an U.X.B. near Cockett Tunnel (Swansea) stopped the main line. 4. OTHER COMMUNICATIONS Ports. Plymouth Port was closed following enemy air activity on the night of 13th/14th February. On the night of 16th/17th February, two H.E. in Kings Dock Area, Swansea, damaged rolling stock and railway lines at a siding. Swansea and Port Talbot Docks were temporarily closed owing to suspected mine-laying.