Detainees at the Bluebonnet immigrant detention center in the small city of Anson, Texas, sent the outside world a message this week: S-O-S.

More than 30 detainees arranged themselves in a dirt yard at the Bluebonnet Detention Facility in Anson, Texas, to form the letters “S-O-S,” an internationally recognized distress signal, while a drone flew overhead,

The facility, located about 200 miles west of Dallas, has been at the center of controversy, particularly over the planned deportation of Venezuelan detainees.