According to AFP, the prisoners held in this prison are the target of President El Salvador Nayib Bukele's fight against crime.
President Bukele wrote on Twitter on February 24: At dawn, in one single campaign, we brought the first 2,000 prisoners to the Counter-terrorism Detention Center (CECOT). He said that this is the largest prison in the US.
This will be their new home, where they will live for decades, and cannot do further harm to the people, President Bukele added.
anchor maxOT will detain up to 40,000 prisoners. Each 8-bed prison will contain 100 prisoners. The El Salvador government insists prisoners will never be able to escape.
On Twitter, President Bukele posted a video showing men walking barefoot, with tattoos, wearing only white shorts, bowing down and placing their hands behind the shaved head.
They sat close together, the person sitting behind pushed his feet to the sides of the person in front, while the guard with weapons covered their faces stood watching.
After that, the prisoners were taken to the car, their limbs were congested, and they were taken to a new prison in a convoy of escorted people with helicopters.
At the new facility, prisoners were also placed close together like before, then led into large groups into the prison.
"We are removing this cancer from society," Justice and Security Minister Gustavo Villatoro said on Twitter.
"Remember, you will never step out of concise references, you will pay the price for being gullible terrorists," Villatoro added.
Built under President Bukele's orders after he declared a war on gangs last March, the prison in Tecoluca - 74 km southeast of the capital San Salvador - consists of eight reinforced concrete buildings.
According to Minister of Public Works Romeo Rodriguez, each building has 32matches of about 100 square meters, designed to hold more than 100 prisoners.
Each prison has only two sinks and two toilets, while for every 100 prisoners, there are only 80 metal beds.
"There will be no cushions in the cells" - the teacher told the press when the project was announced.
Observers have criticized the construction as a violation of detention standards, while social media was flooded with posts praising the president's " study of hardship".
Meanwhile, Moody's credit agency said improved security in El Salvador after the government's gang crackdown could eventually boost investment as companies and consumers regain confidence.
The prison is equipped with dining rooms, gyms and table tennis, but is only for soldiers to use.
Prisoners will only leave their prisoners to attend video legal hearings or be punished in a prison cell with no windows and no lights.
About 63,000 gang members are believed to have been held since President Bukele declared a state of emergency months ago, allowing arrest without a warrant.
