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In the time between mains failing and the generator coming up to speed, there are 280 batteries in 14 battery cabinets which can be seen on the left and right. The orange boxes, called "money boxes", distribute power to the different rooms and racks.
Customers can rent space in this data room which links directly to the data entering and exiting the submarine room.
The space behind the cage has already been taken up by one, unnamed, customer.