The World Health Organization-led team in Wuhan, China, visited a major virus research laboratory on Wednesday (February 3).
It's day six of their fact finding mission into the origins of the COVID-19 pandemic.
Driving through thick morning mist, the team were bombarded by journalists' questions.
Scientist Peter Daszak is the president of the EcoHealth Alliance:
"We're looking forward to meeting the key people here and asking all the important questions that need to be asked."
The virology institute has been the subject of several conspiracy theories.
Some claim that a leak from the lab caused Wuhan's first coronavirus outbreak at the end of 2019.
But most scientists reject that hypothesis.
There have, however, been calls for the lab to release details of all coronavirus samples studied there.
The WHO's field work will last two weeks and has already taken them to hospitals and several markets in the central Chinese city.
The trip has been plagued by delays, concern over access, and bickering between Beijing and Washington.
Beijing has also repeatedly sought to cast doubt on the notion that the pandemic originated in China.