C.S Retriver (4,000 tons) laid the shoe-end section of the Auckland/Sydney and Auckland/Suva sections of the Commonwealth Pacific Cable, which stretches from Vancouver in Canada to Sydney in Australia via Suva and Auckland in NZ.
This picture shows…
C.S. Cable Enterprise (4,200 tons gross) built for Cable & Wireless by Cammell Laird & Co Ltd in 1964, seen here on her sea trials off the Scottish coast.
C.S. Edward Wilshaw (2,247 tons gross) built for Cable & Wireless by Swan Hunter & Wigham Richardson in 1949, seen here leaving the Tyne for her sea trials.
C.S. Recorder (3,300 tons gross) built for Cable & Wireless by Swan Hunter and Wigham Richardson in 1954, seen here in the Tyne as she went on her sea trials.
C.S. Retriever, weighing 4,000 tons gross, built for Cable & Wireless by Cammell, Laird & Co, Ltd (shipbuilders and engineers) in 1960, seen here in 1961 on her sea trials off the Scottish coast.
C.S. Stanley Angwin (2,500 tons gross), built for Cable & Wireless by Swan Hunter and Wigham Richardson Ltd in 1952. Seen here on her sea trials in the North Sea.
This diagram shows a sectioned specimen of deep-sea, light-weight coaxial cable of the kind likely to be used by Cable & Wireless Ltd. and the Canadian Overseas Telecommunication Corporation in the Anglo-Canadian Telephone Cable in 1961.
Typical Morse sounder and single-current key as used by the GPO, railway companies, ship-shore and coastguard stations from the 1880s to 1930s. Note, the metal (usually sheet brass) "reflector" to localise the signal.