Together, Brazil and South Africa have 150 million internet users[1]. At least in Brazil (with which I'm familiar) the connectivity inside the country is quite decent (read "usable"), but most international connections use slow and older networks. This project, together with the one connecting Brazil to Spain[2], will certainly be very beneficial to users in there.

[1]: http://www.itu.int/net4/ITU-D/idi/2016

[2]: https://www.reuters.com/article/spain-brazil-telecoms/spain-...