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The cable comes from the ocean to Cromer, entering the building via this hole in the aptly named "submarine room". The data passes through equipment to transmit and receive optical signals on the terrestrial cable, which will be in the centre of the room.
It then either heads out through 1,152 fibre cables which leave the room via two paths to create backhaul redundancy or diverts to a customer data room.
For the data exiting, one path goes back the way the submarine cable went in: here the grouped pipes carry the terrestrial cables while the lone pipe on the left has the submarine cable.
The data passes a substation outside before heading along fibres leading to the city, where it will link to any carriers' network which has bought capacity.