They will have 20,000 breeding pigs and they can output 600,000- 1.2 million pigs per year. It is in the city of Enzou about 500 miles west of Shanghai. It is a $500 million facility with 800,000 square metres of space.

Pigs stay on each floor throughout their lives and the air system contains any disease outbreak to one floor.

It is the biggest single-building pig farm in the world, with a capacity to slaughter 1.2 million pigs a year.

Pork is the most popular animal protein in the country. China eats around half of all the world's pork. They lost 100 million pigs to the deadly pig disease African swine fever (ASF) between 2018 and 2020.

Waste from the pigs will be treated and used to generate biogas, which can be used for power generation and heating water inside the farm. Workers will be required to go through multiple rounds of disinfection and testing before being given clearance to enter, and won't be able to leave the site until their next break – reportedly once a week.