this is "nightline." >> tonight, inside guantanamo bay. david muir with rare access to one of the world's most notorious prisons. we can see the detainees. >> the president wants it closed. will our next president feel the same? what to do with ret detainees. the americans who say, don't bring them here. >> excuse my french but we say hell no! tonight, inside the final 30. e-mail fail. >> hillary clinton deleted 33,000 e-mails. >> what was deleted, what was classified, "nightline" is on the case. and with the voters. >> it's a bigger trust issue than anything else. >> first here the "nightline 5."

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good evening. it is the controversial prison where the men the u.s. government calls some of the world's most hardened terrorists are being held. gitmo. one of president obama's signature promises was to close gitmo. but will he end up leaving that decision to his successor?

>> fire, fire, fire, fire. >> reporter: we fly to one of the most notorious prisons in the world. on the u.s. naval base at guantanamo bay, cuba. since 9/11, nearly 800 detainees have been brought to guantanamo. we're now on the sprawling naval base, 45 square miles. the only way to get to the detention center is by boat. we make our way to the prison. driving through what looks more like a rows of colorful homes. a mcdonald's. even a high school. for the american families stationed here. we arrive at the detention center. the barbed wire. the gates. tonight, 19 more detainees have been cleared for transfer to other countries. it would leave just 41 left. will they be brought to prisons here in the u.s.? will the president's promise to close guantanamo be kept? >> there was no single cell -- >> we meet the prison warden.

hallways of one of the camp's still open here, camp 6. >> so this is a typical cell block. >> reporter: some of the detainees still here at guantanamo are the worst of the worst. khalid shaikh mohammed, accused mastermind of the 9/11 attacks. they show us many of the detainees who have been here more than 14 years. we are not allowed to show their faces. you can see they're getting ready for prayer. >> some of them are, yeah. >> reporter: we watch as the detainees use army mats for detainees, they cannot see us back through this glass. we just watch as the guards placed these orange cones in front of the doors here. that's a signal to the other guards not to open the doors, not to disrupt them during prayer. we notice through the glass the fence, their own sign, prayer call. they turn it around when they're done. >> it can inflame tensions when they're making unnecessary noise. >> reporter: there are so many signs of their daily routine

detainees carrying cups and plates. >> we watched as one of the guards put on these face masks. >> lessen the risk of them getting something put in their eyes or mouth. >> reporter: he's talking about a cocktail of bodily fluids, blood, urine, feels seals. they call it splashing. they show us the kind of cell for detainees who protest, who are noncompliant. we see the evidence of the splashing on the ceiling. >> it does happen. >> reporter: the colonel tells me there have been fewer clashes with the guards because he many here sense they could be getting out. >> the state department is working very hard to find these detainees places to go. >> are they ready to go? >> i think a lot of them are. >> reporter: the u.s. government says they have increased vetting. now six agencies deciding which detainees are transferred. >> we're heading into the control room -- >> attention! >> carry on. >> reporter: there are monitors inside and out. we see the rec yards. once watching hundreds of

>> do you have any idea how much american taxpayers are paying per detainee? >> no. i don't. i've got to be prepared for the worst-case scenario. >> reporter: tonight the state department says american taxpayers are spending more than $7 million per detainee every year. >> this is our pharmacy. >> reporter: those prisoners are aging. americans paying for their medicine. >> this is for people who are aging in front of you? >> that is correct. >> i'll let you go first. >> reporter: then a rare came up to the roof with cameras? >> i've never done this. >> reporter: we approach the edge. we notice the track for exercise. now a worn path through the gravel. we see them walking on treadmills. then they start to yell our way. >> hey, what's up, camera, i see you, shut it off, i'm going to

ellipticals! >> reporter: they take advantage of a rare moment to speak to the world. >> abc news, tonight i watch the tv, put me on cnn news, abc news -- >> they're aware. >> they are. >> you've heard donald trump say he wants to send more people to guantanamo. >> i have. >> this morning i watched president obama talking about gitmo, guantanamo bay. which by the way, which by the way we bad dudes, believe me, we're going to load it up. >> you did tell me there was progress here. would it fight the progress you've seen? >> well, bite certainly go against what we started. >> reporter: 20 days now until the election. hillary clinton says she stands by the president's plan to shut guantanamo down. because of what it represents around the world. the history of torture. >> we are an islamic army. >> reporter: orange jumpsuits

isis recruitment videos. >> we heard from president obama after he was elected the first time, close guantanamo. >> there we go. guantanamo will be closed no later than one year from now. >> fearly eight years letter it's still open. do you see a day when it closes? >> absolutely. >> reporter: the ambassador, u.s. special envoy tasked with the effort to close guantanamo. >> what do you do with the 41 left? if they're a safety risk, the worst of the worst as i don't have heard what do you do? >> guantanamo houses some dangerous, hardened terrorists, including individuals who are responsible for the 9/11 attacks. what we intend to do is work with the congress to find a suitable facility in the united states. >> excuse my french but we say hell no! >> reporter: near florence, colorado, at a town hall meeting, some of the americans against it. >> we are at war. you have to have a place to put war prisoners. >> it's an invitation for an attack locally.

super max prisons in the world. >> president obama bringing detainees here -- >> reporter: outrage growing across the country. two conservative radio hosts who call themselves the ameri-chicks helping lead the charge. >> it's serving its function well, that's why it should stay hope. >> we sacrifice so much to get these bad guys put away, there's no common sense in doing it. >> families who live in these communities don't want high-risk detainees in their communities. >> they have in their hardened terrorists. they have mr. moussaoui, they have the shoe bomber, they have the underwear bomber. >> reporter: so far, congress has blocked any move to bring any of the detainees here. >> what do you think of americans who might say, move the detainees here, you're simply creating a guantanamo in the u.s. >> it wouldn't be guantanamo in the u.s. >> you'd have 40 detainees stuck here in the u.s. >> that's true. but there's an independent threat that guantanamo itself

is going to be of individuals in orange jumpsuits and open air cages. >> reporter: he argues not everyone at guantanamo is dangerous. 711 detainees have now been transferred to 59 countries all over the world. uruguay. albania. even bermuda. we traveled to bermuda to find halil mahmoud. he spent seven years at guantanamo before being dropped off in >> reporter: he's lived here seven years. no passport, no papers, no way off the island. >> you'd never heard of bermuda? >> we heard about the bermuda triangle. strange place. where the people go and disappear. >> reporter: halil argues that's what's happened to him. in limbo here. and he says he never should have been at guantanamo in the first place. >> i'm not terrorist, never ever. innocent. we have done nothing wrong against u.s. >> reporter: he tells us he was

he is a chinese uighur, part of a muslim minority group that escaped persecution by fleeing to the tribal areas of afghanistan and pakistan. during the war, the u.s. military advertised bounties for suspected terrorists with leaflet drops like these. he was captured and sold to the u.s., labeled an enemy combatant. he was later cleared for release by multiple u.s. courts yet he still sat at guantanamo for seven years. now in berm unsure whether he and the three other detainees dropped off with him will ever be able to leave. >> no passport, nothing yet. you know, me and my sons, stateless. >> reporter: in most cases the u.s. government does ask receiving countries to monitor detainees and to restrict their travel. >> are you still angry that you were brought to guantanamo bay? >> no, i'm not angry.

bay, i left everything behind. >> reporter: unlike halil, there are some released detainees who do turn to terror. in fact, a new government report reveals two more released detainees re-engaging in terrorism. a total of nine under president obama. 113 returning to terror under president bush. >> when you see these new headlines that two more detainees are now involved again, what do you say to the americans who say, this is simply too big of a however, you have to measure that against the risk of keeping the facility open. >> reporter: but if it's closed, perhaps the biggest issue of all, what to do with the detainees deemed too dangerous to transfer? >> colonel, you're aware this president has suggested there are maximum security locations in america back in the u.s. that could take the handful of prisoners who are left. >> true. >> would you have any hesitation

these guys are no more dangerous than any of the prisoners we have in maximum security facilities in the united states. >> already? >> already. >> reporter: tonight the fate of this prison known around the world now lies in the hands of the american voter. next here, it's the story that has dogged hillary clinton throughout this campaign. e-mails. she says using a private server was a mistake. donald trump says she belongs in jail. ? ? ction. one smart choice leads to the next. ? the new 2017 ford fusion is here. it's the beauty of a well-made choice.

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if it weren't for the

against donald trump hillary clinton's e-mails would dominate the news right now, and her digital difficulties keep on coming. tonight we're going to take a deep dive as part of our series "inside the final 30." >> hillary clinton is the most corrupt person ever to run for the presidency. >> there was donald trump today pursuing one of his favorite lines of attack, hillary clinton and her e-mails. >> this is elaborate criminal cover-up -- >> questions over a classified e-mail -- >> e-mail account -- >> e-mails. in one form or they have been dogging clinton throughout this campaign. >> more e-mails that are from the account of the clinton campaign -- >> what do you think is at the heart of this? >> there's the drama of the fbi looking into it and everybody else looking into it. on top of that, you've got now wikileaks adding to that. >> reporter: for the past 18 months, my colleague martha mad d rad dates and this team of journalists have been sifting through e-mails trying to make

to the birth of the candy drawer. >> i spent my weekends reading pages and pages and pages of e-mails. >> would it be safe to say at the heart of this, can we trust this person? >> that's part of the issue for hillary clinton. it's like any election. if you sort of feel some way about a candidate, then something happens to validate that in a way, then it magnifies it. >> reporter: all of this has its roots here in benghazi, libya. in 2014, a con attack on the consulate. >> what difference at this point does it make? >> reporter: when they made a discovery. >> in requesting records from the state department, they noticed that clinton was using a private e-mail. she turned over about 55,000 pages of e-mails. >> new questions this morning about hillary clinton and her use of private e-mail. >> reporter: it wasn't just private e-mails, clinton had a private server too. the state department began releasing to the public those tens of thousands of e-mails

everything. >> she deleted 30,000 e-mails she deemed herself, with her lawyers that were personal. that gave her opponents the opportunity to say, hey, look, she's got something to hide. >> the thing you should be apologizing for are the 33,000 e-mails that you deleted. and that you acid washed. >> secretary clinton, i do want to follow up on e-mails. the fbi said there were 110 classified e-mails that were exchanged, eight of which possible hostile actors did gain access to those e-mails. you don't call that extremely careless? >> obviously, if i were to do it over again i would not. i'm not making any excuses. it was a mistake and i am very sorry about that. >> then he came back and said, why didn't you ask an e-mail question? wait a minute, i just did. >> why aren't you bringing up the e-mails? >> we brought up the e-mails.

>> reporter: at the core of the investigation, was clinton dealing with classified information on that personal server? >> the answer was yes, she was receiving quite a bit of classified information. over 110 of those e-mails had classified information at the time they were sent or received. >> what was the fbi investigating specifically? >> the fbi was investigating whether there were any crimes committed by hillary's use of the private server. if the was classified information on her server and do people know they were sending classified information? >> although we did not find clear evidence that secretary clinton or her colleagues intended to violate laws, there is evidence that they were extremely careless in their handling of very sensitive, highly classified information. >> this is where we get to the stuff that confuses me. how could you be sending classified information and not know it was classified? >> there were markings on three

e-mails, a little "c." hillary said she didn't know what the "c" meant. >> reporter: in the end here's what the fbi decided. >> no charges are appropriate in this case. >> reporter: and this is not the only e-mail imbroglio hounding clinton. just over a week ago wikileaks started to release a trove of e-mails allegedly hacked from the personal account of clinton campaign chairman john podesta. >> the clinton campaign and their number one response is, the russians did this. the russians hacked these e-mails s o through those every day and see if any news is made. so far no smoking gun, nothing that i think is probably going to sway this election either way. but they're pretty telling inside the clinton campaign. you see how calculated they are. >> reporter: and how concerned the campaign has been about her own private e-mail controversy. >> really it shows that the clinton campaign knew really early on that this was going to be a huge issue for her campaign. we had like another top dem adviser writing to john poe

just apologize? her inability to do a national interview and communicate genuine feelings of remorse and regret is becoming a character problem. i see no downside to her saying i'm sorry. yeah, john podesta replies, we're all in the same place trying to figure out how to get her there, the best way to execute. >> a week and a half later we see her about on with david muir of abc. >> that was a mistake, i'm sorry about that i take responsibility. i'm trying to be as transparent as i possibly can. >> actua way to see the inner workings of how these things unfold, how they came to be, how they happened. >> reporter: with the election less than three weeks away, how is this playing in the real world? >> you've gone out and spent time with real voters. what are you hearing? >> the e-mail story absolutely has relevance nated. >> i'm not a hillary fan. for me it's a bigger trust issue than anything else. >> if you ask somebody who supports hillary clinton, they will say, everybody makes

>> absolutely not. >> and why not? >> i don't really think she did anything wrong. >> there are bigger things that they could be focusing on in the election, aside from this particular situation with her issues with e-mails. >> reporter: the e-mail issue will undoubtedly be combustible once again in the next debate, now just hours away. abc news will have full coverage of tomorrow night's third and final presidential debate

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