Relatively thin and roughly the width of a garden hose, these cables stretch for around 1. 7 million kilometres – long enough to wrap around the Earth several times. These invisible highways, consisting of fiber-optic wires connecting landing points, are placed hundreds of metres below the surface of the ocean by cable-laying ships. It is one of the few installation of this kind in Germany Optical attached cable (OPAC) is a type of fibre-optic cable that is installed by being attached to a host conductor along overhead. They all travel over fiber optic cables about the size of garden hoses snaking along the sea floor. They connect major cities and data hubs such as New York and London, Lagos and Lisbon, Singapore and Los Angeles.