What happens next?

How to fix sinkholes
Monitor the hole to see if it grows.
Sinkholes are often triggered by weather phenomena, such as a heavy rainstorm. Once a sinkhole has formed, though, it can continue to grow, as further portions of limestone or other carbonate rocks fall away.
As long as a sinkhole continues to grow on a day-by-day basis, do not attempt to fill it in. Once the sinkhole has stopped growing and remained the same size for a few days, you can fill it in.