The alarm is sounding in the UK's first drug consumption room. A man in his 30s has overdosed in the "using space" – a room in the Glasgow facility where nurses supervise injections in eight booths.
Obviously, it's working just fine.
He had only arrived at The Thistle minutes earlier, animated about being searched by police on the Gallowgate. Staff rush to help, bringing him from his seat to a crash mat on the floor. Our film crew is ushered out of the area while an ambulance is called and staff work to save his life.
I've only one question: why?
Eddie Kearney, a harm reduction worker, tells us that the man had already taken drugs three times that day. "He's using a 'snowball', he's using heroin and cocaine," he explains. "He's been in there two minutes and he's on the floor."
And the title 'harm reduction worker' is a sick joke, isn't it? It supposes that the heroin and cocaine trade - which this initiative is helping to keep going - causes no harm.
Less than an hour later, the alarm sounds again, for another man in his 30s. He had been led to reception by workers from a charity, then made his way to the booths to inject heroin. Lynn Macdonald, the service manager, tells us it is another medical emergency.
"The first four weeks, there were no medical emergencies, and then this week we've had five. "It could be a batch of drug that is problematic. People are noticing a difference in the heroin when they making it up, saying they are noticing a green tinge to it."
But it doesn't stop them injecting it, of course. Nothing will. They are addicts.
Lynn Macdonald later told us: "I am absolutely convinced that had we not been present during the overdoses we've seen within the Thistle, then people would not have survived."
And you feel that this has somehow been a good thing for society?