How does the internet go from country to country? It travels through thousands of kilometres of underwater fibre optic cables which can transmit information up to 99.7% of the speed of light.
This website shows all cables currently being used
Huawei, the Chinese telecoms giant, has hit the headlines over the arrest of the founder’s daughter in Canada for extradition to the United States.
But the firm, which manufactures a range of technology from network equipment to mobile phones, is on the agenda for other reasons too.
Some Western governments have blocking telecoms companies from using Huawei gear in new communications networks, citing security concerns.
So far the UK has held back from any formal ban. So does the firm pose a threat?
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