COPPER Face Jacks' first over-18s night was always likely to be packed.
It took place on the same day that thousands of students returned to college after the Christmas break.
Billed as 'Messy Mondays', it was advertised on social media and, according to the promotion, was "guaranteed to be busy".
Drinks were going for €3.50 and teenagers were in line to win two bottles of champagne by commenting on the event's Facebook page.
Shocking mobile phone footage reveals the extent of the chaos in the narrow alley.
Screams can be heard from young revellers who are pinned to the ground.
A cry of "whoa" comes from the person taking the footage as she points to a crowd of people piled on top of each other.
The video shows teenagers struggling to free themselves from the mayhem.
At one stage, a young woman's high-pitched scream is heard above all the others when the crush sways to the side.
In the melee, someone urges another person to "get out, get out, get out".
Dublin Fire Brigade said it received a number of emergency calls from people on Harcourt Street at 11.50pm on Monday.
Afterwards, a 19-year-old girl spoke of how she was pressed against railings.
Hannah Kelly, speaking to Niall Boylan on Classic Hits 4FM, said the crowd "just started to surge forward at the top of the queue".
People were "just pushing forward", crushing her into the railings.
"I was asking and shouting to the bouncers that I couldn't breathe. My arm was getting stretched and twisted so I was asking to get out," Hannah said.
"I just wanted to get out of the situation as soon as possible. There were a lot of bouncers around doing the best they could to try and control (it), but with the crowd so huge they couldn't," she added.