Usman Muhammad pauses by the entranceway to a tiny Nigerian situation compartment and leans his forehead against the partition incapable to speak.
The time earlier helium had been trapped wrong the stifling room, measuring astir 6m (19.7ft) by 3m (9.8ft), with much than 50 different prisoners.
Thirty-three of his cellmates died successful the cramped conditions successful the situation successful Minna, the superior of Nigeria's Niger authorities - and 4 died aboriginal successful hospital.
The wide deaths caused an outcry and sparked protests, including attacks connected nationalist buildings, arsenic relatives and locals demanded answers.
Federal officials had initially blamed the deaths connected a diphtheria outbreak but precisely what happened is present the taxable of an investigation.
"I person ne'er felt vigor similar that successful my life. When we touched each other's bodies, it felt similar occurrence burning," Muhammad tells the BBC erstwhile helium is capable to stitchery his thoughts.
When helium was locked inside, determination was lasting country lone amid humidity levels of much than 90%, which successful immoderate circumstances tin beryllium unsafe to quality wellness arsenic it prevents the earthy cooling mechanics of sweat drying connected the skin.
The somesthesia extracurricular was supra 25C and the lone ventilation came from a small, high-up window.
"One of america fainted and we started knocking astatine the [cell] door. When [a guard] came we asked him for water. He looked astatine the feline that fainted and closed the door. That's however they started dying 1 aft the other," Muhammad says.
Like the others who had been detained, the young man, successful his 20s, is an artisanal miner, eking retired a surviving searching for precious metals astatine excavation sites.
The national authorities has tried to ace down connected this alleged amerciable enactment arsenic it says it costs the state revenue, damages the situation and tin beryllium linked to wider transgression activity.
Officers from the Nigeria Security and Civil Defence Corps (NSCDC) had arrested a ample radical of miners adjacent Minna past Tuesday and Wednesday.
The prisoners were held astatine its detention centre successful the city, but the NSCDC has not shared either the names oregon the fig of those it was holding.
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