https://github.com/diem/diem is 387,952 lines of Rust code across 169 crates. In total there are 3 lines of unsafe code, which is less then 0.001% (1 thousandth of 1%).
> The launch was originally planned to be in 2020 but only rudimentary experimental code has been released until the project was abandoned in January 2022.
https://en.wikipedia.org/wiki/Diem_(digital_currency)