In recent months, the US has seen a massive rise in migrants and asylum seekers from Central America. Violence, natural disasters and pandemic-related economic strife are some of the reasons behind the influx, experts say.
Some have also suggested the perception of a more lenient administration under Democrat Joe Biden has contributed to the crisis, though the White House has urged migrants against journeying to the US border.
The tented camp in the Fort Bliss military base in El Paso, Texas, is the temporary home for over 2,000 teenaged children who have crossed the US-Mexico border alone and are now awaiting reunification with family in the US.
Findings from the BBC's investigation include allegations of sexual abuse, Covid and lice outbreaks, a child waiting hours for medical attention, a lack of clean clothes and hungry children being served undercooked meat.
The BBC has spoken to camp employees about these conditions and seen photos and video smuggled out by staff.
The Fort Bliss camp consists of at least 12 tents, some of which house hundreds of children at a time. The children spend most of their day in the tents, getting out for an hour or two of recreation, or to line up with hundreds of others for a meal.
Staff told the BBC the food was mostly edible, but a 15-year-old who has now been released said he was fed uncooked meat. "Sometimes the chicken had blood, the meat very red. We couldn't stand our hunger and we ate it, but we got sick from it."
A number of tents have also been set up just to accommodate the large numbers of sick children - the children have nicknamed it 'Covid city'.
"Hundreds of children have tested positive for Covid," said one employee who asked to remain anonymous because staff are banned from speaking about the camp.
In addition to Covid, outbreaks of the flu and strep throat have also been reported since the camp opened in late March.
And some children in need of urgent medical attention have been neglected.
In a secret recording of a staff meeting in May given to the BBC, an employee told of a child who was coughing up blood and needed urgent medical care.
"They said 'we are going to send him to lunch'," the employee reported another staff member as saying. "It was a three and a half hour wait to see anybody."
The 15-year-old who spoke to the BBC was released last month after 38 days in detention. He said he caught Covid-19 soon after arriving in the camp, and became severely ill. After he recovered, he was sent back to live in a crowded tent and became ill again.
"When we went to ask for medicine they gave us dirty looks, and they always laughed among themselves," said the boy, who preferred to remain anonymous, of some camp workers.