. Port of London Authority De Neumann began developing thoughts on the potential for a port-control system while he was captain of HMRC Vigilant. These ideas followed on from considering such incidents as the accidental ramming of the submarine by HMS Divina in 1950, the Norwegian vessel Baalbeks collision with the Nore Army Fort in 1953, and the disastrous North Sea flood that resulted in the flooding of Canvey Island, Foulness and the East Coast in 1953. In these and other situations, rescue and intelligence gathering were severely hampered by a lack of centralised command and control, which led to a lack of situational awareness. In 1953, de Neumann resigned his command of HMRC Vigilant following the Spithead Review and transferred to the Port of London Authority. He then put in place a feasibility study of a port-control system which he oversaw throughout its development and ultimate installation at Gravesend, which was completed in 1960. He served as Harbourmaster, and, after his health deteriorated owing to his earlier imprisonment in West Africa, Dockmaster at Tilbury. Commendations De Neumann was commended for his handling of the rescue attempt following the sinking of the Tug Sunfish under Tower Bridge on 12 March 1960. The Sunfish was aft and the Sun VI forward of the Ellerman Lines' Palermo, dragging through Tower Bridge inward bound in the Upper Pool, when the Sunfish was dragged on the Northern Buttress of the bridge. Her stern struck, rolling her over, and she sank with the loss of her Chief Engineer. She was raised the next day, refurbished, and returned to service. Another commendation came for his part in rescuing the crew of the Tug Kenia when she sank in the New Lock bellmouth, Tilbury Dock, on 25 August 1964. The Crested Cock and the Kenia were undocking the Maashaven from Tilbury Dock New Entrance. The ship started her swing to starboard in the Bellmouth and the Kenia was on the port bow when coming around, the Maashaven went ahead and pinned her to the upper dock head before she cleared the ship's bow. The Kenia was cut from the deck to the keel in the after end of the engine room starboard side. A line was passed to the pier head and secured, and all crew rapidly taken ashore, before she sank. Kenia'' was raised by the PLA Salvage Department and scrapped. He was also commended for