Equiano, fully funded by Google, is the company's third private international cable.
The search engine giant, which has invested $47 billion in improving its global technology infrastructure over the last three years, said Equiano is the company's 14th subsea cable investment globally.
"Equiano will be the first subsea cable to incorporate optical switching at the fiber-pair level, rather than the traditional approach of wavelength-level switching," Google said in a blog post.
Google said a contract to build the cable with Alcatel Submarine Networks was signed in the fourth quarter of 2018, and the first phase of the project, connecting South Africa with Portugal, is expected to be completed in 2021.
The company in April completed the "Curie" project, its first private intercontinental cable, connecting Chile to Los Angeles.
It also announced last year the Dunant transatlantic submarine cable project connecting France and the United States. The 6,600 km cable is scheduled to come into service in 2020.
Subsea cables form the backbone of the internet by carrying 99 percent of the world's data traffic. (Reporting by Arjun Panchadar in Bengaluru; Editing by Maju Samuel)

An image showing the words Alphabet and inc. being used as search criteria in a Google search on a computer, Frankfurt, Germany, 24 April 2018. Alphabet, the parent company of Google, on late 23 April 2018 reported its first quarter 2018 results, saying its revenues in 1st quarter rose 24 per cent to 24.9 billion USD, more than the 21 per cent that was expected by analysts. Revenues in Alphabet's businesses not linked to advertising rose 36 per cent. Operating income for the first three months stood at 7,001 billion USD, compared with 6,568 billion USD in 2017. EPA-EFE/MAURITZ ANTIN
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