Here is an interesting blurb from Zero Hedge citing a 2017 Nature article about the BSL-4 facility in Wuhan.
Zerohedge
ZeroHedge - On a long enough timeline, the survival rate for everyone drops to zero
www.zerohedge.com
Inside the Chinese lab poised to study world's most dangerous pathogens - Nature
Maximum-security biolab is part of plan to build network of BSL-4 facilities across China.
www.nature.com