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The surroundings were grim and forbidding, a notorious jail run by Afghanistan's feared security service for those taken prisoner in the bloody war with the Taleban.
Among the inmates: Shakirullah Yasin Ali; a small, frail boy, just 14, arrested as he prepared to carry out a suicide bombing against British and American targets. "If I had succeeded, I would be dead now, I realise that," he said in a soft, nervous voice.
"But those who were instructing me said that if I believed in serving God it was my duty to fight against the foreigners. They said God would protect me when the time came."
It was a suicide bomber like Shakirullah who this week claimed the lives of three more British soldiers in Helmand, bringing the total number of British fatalities in Afghanistan to 100.
The Independent spoke to Shakirullah, a Pakistani Pashtun, one of the youngest ever suicide bombing suspects, after he was captured in a raid at the town of Khost in Afghanistan.
Sitting cross-legged on the floor of the prison run by Afghan intelligence, the NDS, Shakirullah said: "I do not know what is going to happen to me. All we were told was the British and the Americans were in Afghanistan and they were killing Muslims.
"All I know is what the mullahs told me and kept telling me, that the British and the Americans were against God," he said with his head bowed down.
Shakirullah, one of four children of Noor Ali Khan, a farmer, lived in the village of Tandola in the Pakistani region of South Waziristan. He said his education was at a madrassah run by two imams, Mullah Saleb and Mullah Azizullah. About 50 students between 13 and 22 attended the school, where the syllabus consisted of learning the Koran by heart, interspersed with political lectures.
About two months ago, he finished a first course in Koranic studies. He was then approached by the mullahs who told him the time had come for him to serve God in Afghanistan.
"Mullah Saleb said I would be striking a blow against the foreigners, the British and the Americans, and get justice for all the people being killed. I was told I must leave at once and they would talk to my family on my behalf. I wanted to see my mother and father but I was told that was not possible for security reasons. That upset me but I thought I will be seeing them again as soon as I got back. They said my family would get well paid for what I was doing."
On the way to Afghanistan, Shakirullah said he was told by a mullah that his mission would involve driving a car bomb. "I said I did not know how to drive but they said they would teach me, they said I would not have to drive far. Mullah Saleb said it was too late to stop. He kept saying that to be a good Muslim I must fulfil my duty. I was missing my family but I did not know how to go back to my village and I did not know anyone in the area I could run to. There was nothing I could do except pray I would be all right and my family would be all right."
Shakirullah says he was driven across the border and taken to a house in Khost. "There were a few more people there and the leader was a man they called the Doctor, he and Mullah Saleb took me for driving lessons and took me to sermons in the evening. The Doctor brought the explosives in two bags for the car and he was the one who made the bomb. I was told I would soon be ready to carry out my mission."
But the car being prepared for the bombing, a Toyota Corolla, had stalled a few times while Shakirullah was being taught to drive and, on one occasion, he and the Doctor had been closely questioned by the police.
Forty-eight hours later, the house where they were staying was raided by Afghan and Nato forces.
"I had been told by the mullah that I was ready to go, the time was right. But then they came during the night, the soldiers, and smashed down the doors. There were Afghans and foreigners. A gun was stuck to my face and I thought I was going to be killed. They dragged us all out and took us to a prison."
Shakirullah's attack may have been prevented but not that of the bomber who took the lives of Nathan Cuthbertson, 19, Charles David Murray, 19, and Daniel Gamble, 22. They had been going to speak to local people when a bomber detonated an explosive vest strapped to his chest.
LOTTERY OF SIMPLY STAYING ALIVE
For the soldiers fighting in Afghanistan life has become a lottery of roadside bombs and suicide attacks.
Gone are the days of pitched battles when squads of Taleban fighters would attack en masse and fight for ground. Back then, a soldier could fire and manoeuvre to survive.
Now they take their chances against an enemy they rarely see - the homemade bomb - sometimes strapped to a fanatic's chest, more often simply buried in the desert to await its unknown victim.
The day Royal Marine Dale Gostick died, his patrol had fought off 15 insurgents who attacked their armoured vehicles with grenades and machineguns.
What killed him was a roadside bomb. The lottery has left the men and women on the front line facing a threat that lurks hidden among the people they hope to win over. The Taleban may have failed to rout British forces but they have forced a wary distance between the soldiers and their prize.
When the British forces venture out on routine foot patrols, the fear of a suicide attack is palpable. Before leaving their Musa Qala base last week, soldiers were reminded to split their first aid kits between their left and right pockets in case one half of their body was blown off.
Afghans who come too near - whether adults in cars or walking teenagers - are screamed at to keep their distance. If that doesn't work, rifles are raised in warning. Even the locals understand the soldiers' fear. If a driver doesn't stop the moment he sees a British patrol his neighbours will berate him. They know how quickly shots are fired.
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