is in detention centers that attorneys call black holes. they say detainees can be unreachable for days. it's happening in rural areas of the deep south where most people don't even know these facilities exist. along the winding roads of the american deep south, the immigration battle has a new front line. so this is the facility where he is staying. >> this is it. >> reporter: this is adams county correctional center in mississippi, a private prison now contracted to immigrations and customs enforcement. we are outside one of the detention centers in mississippi. the men behind me are shouting in spanish. it's more than one of a dozen such facilities in louisiana and mississippi, now holding more than 8,000 i.c.e. detainees shared with new details from nbc