he was then held here, in ade abieto prison, just outside the capital, asmara, for more than four yearsetic guard helped him smuggle in a small camera. >> michael: >> narrator: and he worked with one other trusted prisoner. >> michael: (indistinct chatter) >> narrator: the other inmates were not aware michael was filming. >> michael: >> narrator: the prisoners can be seen packed into large holding rooms. according to michael, they can be held like this for years without trial. >> michael: (distant coughing) >> narrator: michael said many of his fellow inmates were there for avoiding conscription like him, or attempting to escape the country, or helping family members flee. (indistinct chatter) >> michael: >> guard (in tigrinya): >> michael: >> guard: >> michael: ♪ ♪ >> narrator: michael was one of more than 30 eritrean refugees we interviewed ovethe course of our investigation. for their safety, we agreed to conceal many of their identities. we also reviewed and verified more than ten hours of secretly shot footage from inside the country. the eritrean government would not speak to us a