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Spill and airsol would be created, that space suit would prevent that airsol from entering the breathing space of the scientist to infect them. >> reporter: but other red flags came from the chinese directors them who in 2018 co-authored a paper pointing out safety issues across all bio safety labs in china. warning in part that there was a lack of enough operable technical standards but ultimately many international experts wued the wuhan bsl4 one of the most sophisticated in the world and rese...

Chinese before the outbreak. here is what we know. planning and construction of the bsl4 started in 2003 and 2018 it officially became operational. its located on the sprawling fenced in wuhan institute of virology campus, the building containing the lab sits separate. four levels make up the structure. at the top, sophisticated air purification system. at the bottom, and underneath the lab, decontamination equipment that allows for safe, sewage disposal. level two, this is where the research ta...

>> reporter: the evidence supporting a lab leak for now is all circumstantial, starting with the labs location. the bsl4 lab or bio safety level 4 is about 25 miles from the seafood market where many of the first covid-19 cases initially emerged. >> i dont think anyone would disagree that the major first amplification occurred in wuhan. >> reporter: if the first amplification was from a lab, that would suggest either a lab worker unknowingly got infected or the virus was isolated or manipulated ...