The massive underground facility, which has been used to store archives since the 1960s, remains a crucial but convoluted hub for US government records.

On Feb. 11, tech billionaire Elon Musk and the Department for Government Efficiency, which he leads, made a series of claims about a limestone mine in Pennsylvania where the U.S. government allegedly processes federal employee retirement claims manually.

Musk’s so-called Department of Government Efficiency claims to have already made more than $100bn of savings but only a handful of departments registered any decreases in the first full month of the new administration.