Iran is already choking off a fifth of the world’s oil needs through its blockage of the Strait of Hormuz. But while attention is mostly fixed on the stranded oil tankers, another pressure point lurks beneath its waters: a critical chunk of a global network of undersea internet cables.Iranian officials and state-linked media recently floated a plan to charge big tech companies Google, Meta, Microsoft and Amazon, as well as submarine cable operators, billions in annual transit fees for the use of the submarine cables that connect Europe and Asia via the Middle East. Media linked to the Islamic Revolutionary Guards…