It's a place the israeli military doesn't want us to see.

How many Palestinians are in there, right?

Who are you?

Give me a pizza. Now.

Hang on. What is it that you want?

But CNN has gained exclusive evidence of palestinian prisoner abuse from multiple israeli whistleblowers at the Sedi Taman facility in southern Israel. We joined human rights activists amid growing public concern for the detainees being held inside.

This is a protest by israeli citizens outside a detention center close to Gaza where we know hundreds of Palestinians been held. You can see it's a closed military facility. It's behind a barbed wire fence.

We're not permitted access, and there's hostility from passersby. We just had somebody drive past in.

A car and they shouted out to.

Us in Hebrew, you're defending murderers.

You're defending.

What are you.

We're defending basic human rights.

And eyewitnesses are now speaking out.

Away.

From the military facility near the beaches of Tel Aviv. One young israeli army reservist agreed to speak about. Scores of detainees at Seditiman he says are kept in cages or pens, constantly shackled and blindfolded, many for weeks on end. We've hidden his identity and voice to shield him from prosecution.

We were told they are not allowed to move and must sit upright. They're not allowed to talk or peek under their blindfolds.

And what happened if they did do that? What kind of punishments would we to it?

We were allowed to pick out problematic people and punish them, having them stand with their hands above their heads for an unlimited time. If they didn't keep their hands up, we could zip tie them to the fence.

The israeli military says detainees are handcuffed based on their risk level and health status. But the account tallies with photographic evidence obtained by CNN of palestinian detainees inside Sedi tamen, and with hand and wrist injuries shown to CNN by dozens of Palestinians released back into Gaza. I was zip tied and blindfolded, says this former detainee, and tortured in a way I never imagined, one source telling us the restraints were so tight they had to amputate a man's hand.

The view that I've heard expressed is, is that, you know, how do you think israeli hostages are treated by Hamas?

This sentiment was voiced in the facility. But I think that if Hamas is so abominable, which I agree with, then why use Hamas as a bar? It's a descent into dehumanization.

A descent that's accelerated since the rampage by Hamas on October 7 last year. The killing and abduction to Gaza of hundreds of Israelis provoked outrage and a brutal response mid Israel's wrath. Tens of thousands of Palestinians have been killed and thousands detained for interrogation, transported to facilities like Seder Taman, where one israeli guard now tells CNN, prisoners are routinely beaten. We've hidden his identity and voice, too.

You can take them out and hit them maybe four or five times with a club. It's not down in the face, so you don't see blood. The detainees lie belly down, being hit and kicked, people screaming and dogs barking at them. It's terrifying. Some detainees are taken away and bitten really hard. So bones and teeth are broken.

So you saw people who were subject to these beatings who had their bones broken and who had their teeth broken?

Yes.

It's a practice which commanders know about. They want intelligence, but they also want revenge and punishment for what happened on October 7.

The israeli military hasn't approved CNN's requests for access to seditiman. At the gates of the facility, we challenged the israeli guards.

How many Palestinians are.

Do you know if they're being handcuffed?

Are they being blindfolded?

Oh, no, no.

This is a facility.

As we leave, masked soldiers approach.

Hello. How are you?

Young? Try to take our cameras.

What is it that you want? My camera or my card?

Then order us to leave.

Well, we're driving now to meet one Israeli with personal experience of the Sudai Tayman facility. It's experience that he says has left him shocked at the condition and the medical treatment of palestinian detainees there.

Hello.

He told us he treated palestinian detainees with gunshot wounds fresh from the war zone in Gaza, but was appalled at the lack of equipment and expertise.

The problem is Gazans who were brought in are labeled as terrorists. And it is very popular opinion over here that terrorists deserve to die, so they do not deserve the same medical care as everyone else.

Satellite imagery obtained by CNN shows how the Sedi Taman facility was expanded after the October 7 attacks, with detention facilities and makeshift medical bays being added after public hospitals in Israel refused to treat injured guards and suspects. Eyewitness accounts describe a field hospital with 15 to 20 patients, virtually naked and blindfolded, with hands and feet, shackled to their beds and wearing diapers. What eyewitness told CNN painful procedures were carried out by underqualified medics. Treatment, the medical worker told us, amounts to punishment.

In my view, it's the idea of total vulnerability. If you imagine being unable to move, being unable to see what's going on, that's something that borders, if not crosses, into psychological torture.

The israeli military says prisoners are stripped for security checks and that investigations are opened when there's suspicion of misconduct. Still accounts from Israelis and Palestinians inside, and the shocking images paint a disturbing picture. Matthew Chance, CNN, at Seditiman in southern Israel.