I found this article in “The Age” archives from back in 1967. It was part of a large article celebrating the opening on the Seacom cable on this day. Initially only the first supergroup was commissioned on the cable that could eventually hold 2 x 80 channel supergroups.
The supergroups were 3.1kHz bandwidth compared to the 60 channel satellite supergroups that consisted of 3.4kHz bandwidth channels. There were about 6 pages of a broadsheet newspaper dedicated to the opening.
Note you can click to open the Newspaper article below and click a gain to enlarge. Use you browser back arrows to return to the exOTC website.