The girls were repeatedly raped, resulting in five pregnancies. One of those was carried to term, but the Castro brothers beat the girls into having miscarriages for the other four pregnancies.
Israel Lugo, a neighbor of Ariel Castro, said he, his family and neighbors called police three times between 2011 and 2012 after seeing disturbing things at the home of Ariel Castro. Neighbors saw naked women on dog leashes in Ariel Castro's backyard. They also heard banging on the windows, which were covered in plastic. According to the neighbors, police didn't take their calls seriously.
From these horrific stories we are starting to get a sense of how Amanda Berry, Gina DeJesus and Michele Knight remained in captivity for so long without being discovered. It seems they almost were, several times.