Subsea cables are described as the "backbone of the internet" by the Global Digital Inclusion Partnership, a group trying to get the world's population "meaningfully connected" to the internet by 2030.
Meta has already developed more than 20 subsea cables, while rival tech billionaire Elon Musk is using parades of low-orbit satellites to increase internet connectivity.
The owner of Instagram, Facebook, and WhatsApp will build a 50,000km (31,000-mile) cable, which is longer than the Earth's circumference, to make sure artificial intelligence and other new technologies are accessible around the world, it said in a blog post.
Project Waterworth will open "three new oceanic corridors with the abundant, high-speed connectivity needed to drive AI innovation around the world," wrote Meta on its engineering blog.
"As subsea cables increase data traffic competition and bandwidth availability, the price for each gigabyte of data decreases," wrote the group in a report on the topic last year.
