Microsoft and Facebook have announced plans to build the highest capacity data link between United States and Europe, the BBC reports.
The tech companies will help design the subsea cable which will run between Virginia in the US and Bilbao, Spain.
The project will be managed by the Spanish telecommunications firm Telefonica, which will sell any unused capacity on the cable to other customers.
The cable will help the tech giants move data more quickly and cheaply between their global data centers.
The Tech companies typically have to pay telecommunications firms to use their cables, which can be costly. And the large amounts of data moving across those lines can make them slower.
The project, called MAREA, will be the highest-capacity sub-sea cable across the Atlantic, with an expected capacity of some 160 terabytes per second of data, the companies said.
It is not the first subsea cable to be sponsored by a tech company.
In 2014 Google paired up with five telecommunications firms to build a sub-sea cable across the Pacific Ocean.