A system for storing long-term digital data comprises data storage equipment including one or more data storage devices 26 stored in a sealed data storage module 10, which is positioned within a data center enclosure 101, which contains a body 12 that is surrounded by a strengthening shield 14. The body contains a network of tunnels 16. One or more data storage modules 10 are stored in a tunnel 16 that is inaccessible to human beings and comprises robotic movement means. Data can be stored before or after the data storage device 26 is sealed within the data storage module body. A utility distribution system can be positioned in proximity to the data storage module 10 for the utility distribution module to provide contactless power and network connection to the data storage module and for the data storage module to retrieve and transmit to the utility distribution module 34 data that is held in the data storage device 26. Powering of the data storage module occurs only when access to the data storage devices is required. One the other or both of the data storage module 10 and the tunnel 16 is operable to self-destruct when tampering is detected. The data storage module can also process the data stored under user instruction and store the results, including secure encryption and decryption of data.