Nanocrete
Nanocrete is generic term for a programmable self-repairing foundation material. In its raw form, it is a dull grey material considerably smoother than concrete. It also has a noticeable bluish sheen in certain lighting conditions. Nanocrete first began appearing in buildings in 1401 AAI, then used extensively in the same century to reinforce Heva's Level 1 to provide structural support for subsequent levels.
Nanocrete can only be programmed if it is powered and with the correct encryption key.
Notable incidents
A significant portion of Level 25 was collapsed in 2773 AAI when the terrorist group X gained unsanctioned access to the First Ecumenopolis. The nanocrete structural reinforcement blocks were destablized, collapsing an area around 100 km3 before emergency nanocrete deposits halted the collapse. A total of 362,891 individuals were killed, with a total of 920,172,583 injured.