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.

A human SOS written in the dirt could be its makers’ last cry for help before they’re shipped to an El Salvador prison so brutal it has sparked unverified conspiracy theories of death camps and torture.

The Bluebonnet facility in Texas houses many Venezuelans. The US immigration officials have issued notices to them, accusing them of being members of the notorious transnational gang Tren de Aragua. The notice also states that all the accused will be deported under the Alien Enemies Act of 1798,