and well equipped with cameras, sun flower's managers keep watch on six video monitors inside. >> the owner has security other the girls. so they can't leave the facility, they know if they're coming or going. >> year after year, authorities including the fbi receive reports of young foreign women being coerced into selling sex for cash at sunflower. >> there were so many signs of trafficking. there was living quarters found in the space, holes in the walls where women who were working as so-to-speak practitioners were hiding because they didn't have licenses. >> sun flower's biggest achievement was building secret hiding places to house women. the first was discovered behind a false wall in 2006. >> what is this? >> this is where they were sleeping previously. >> this was a room with a lot of mattresses. shoes, there could be about 8 to 10 people sleeping in that