Tesla is restarting production at its massive Shanghai factory as the city of 25 million begins to ease lockdown restrictions following a substantial COVID outbreak.

According to a report from Bloomberg News that cites internal company memos, the factory will re-open in what’s being called a “closed-loop system” — an approach encouraged by Shanghai authorities to get people back into the workplace while maintaining the country’s zero-covid strategies. Essentially, this means nobody goes in or out: employees will live and work at the factory, with the first “shift” entering earlier this week and expected to stay until May 1st under the city’s current COVID policies.

In addition to COVID restrictions, Bloomberg says Tesla is also increasing working hours to try and claw back the roughly 40,000 cars it’s missed producing since the factory shut down on March 28th.