Shocking moment a bloody brawl erupts at an underground lingerie bar in Sydney leaving a bartender with stab wounds - as one of the accused men makes an extraordinary claim outside court

A bartender suffered a punctured lung after he was allegedly stabbed during a brawl at an underground Sydney lingerie venue - as one of the men accused of the attack claims he 'doesn't remember' what sparked the melee.   

Five men were asked to stop smoking in the non-smoking area of Concourse Bar, nestled in Wynyard Station, at about 6pm on Thursday and a scuffle ensued.   

Police allege a 19-year-old man from south-west Sydney, who was among the group of five men, stabbed 34-year-old employee Lawrence D'iapico-Bien twice in the back. 

Mobile phone footage shared with Seven News captured the moment women dressed in lingerie ran to help their colleague after he had been injured. 

NSW Ambulance paramedics treated the worker at the York Street bar before he was taken to St Vincent's Hospital in a critical condition. 

The five men allegedly left the scene - three were arrested and charged a short time later - while the 19-year-old was arrested on Friday.       

Emergency services were called to the York Street bar (pictured above) and treated the worker before he was taken to St Vincent's Hospital in a critical condition

Three men were arrested shortly after the brawl. Kevin Piggott appeared at Central Local Court on Friday and said he couldn't remember what sparked the alleged attack 

Kevin Piggott, 31, from Padstow, was charged with assault and affray on Thursday night and appeared at Central Local Court on Friday morning, The Daily Telegraph reported. 

Mr Piggott explained he didn't know the man with the knife and when asked if he was sorry and if a 'good night had spiralled' he responded 'yeah, 100 per cent'. 

The court heard Piggott, a Sydney Harbour Bridge scaffolder, was allegedly less seriously involved in the alleged stabbing than his co-accused. 

He was granted strict conditional bail to report to Revesby Police Station three times per week and banned from exiting trains at Wynyard station. 

Mr Piggott, who has no previous criminal history, was also banned from entering Concourse Bar and making contact with the co-accused or victim Mr D'iapico-Bien.  

Bartender Lawrence D'iapico-Bien , 34, remains in a serious but stable condition

A group of men five men were drinking at the Concourse Bar, tucked inside Wynyard Station in Sydney's CBD, at 6pm on Thursday when a barman was allegedly stabbed (pictured above)

A second man, 29, from Narwee was charged with affray on Thursday and granted conditional bail to appear in court on November 26. 

A third man, 34 from Ridgewood in Western Australia was arrested and issued an infringement notice for offensive language. 

Officers launched a manhunt for the 19-year-old, alleged to have stabbed the worker, after he reportedly left his ID behind at the bar. 

The 19-year-old handed himself in at Green Valley Police Station, in southwestern Sydney, on Friday before he was transferred to Liverpool Police Station.  

NSW Police launched a manhunt for the 19-year-old who allegedly stabbed the worked. He reportedly left his ID at the bar and police released CCTV images amid their investigations

The 19-year-old handed himself in at Green Valley Police Station, in southwestern Sydney, on Friday before he was transferred to Liverpool Police Station. Police released CCTV images amid their investigations

He was charged with assault occasioning actual bodily harm, affray and wounding a person with intent to cause grievous bodily harm. 

The Bonnyrigg Heights man was refused bail and set to appear in Parramatta Local Court on Saturday.  

One man remains on the run and the investigation is ongoing.

Pensioner and bar regular Mark Wroe, 46, told Daily Mail Australia he was shocked by the brawl.  

'I've been here each Friday for years and nothing has happened,' he said.

'Although I don't think there is a smoking area... not that I'm aware of but there's been a few people thrown out for that.'    

The bar is hidden right in the middle of Wynyard train station, at the bottom of the escalators leading to York Street 

Mr Piggott is pictured on Friday, the day after the alleged stabbing in Sydney's CBD

Pensioner Mark Wroe , 46, still turned up to his regular Friday bar and patiently sat outside waiting for it to open, despite knowing about Thursday's alleged stabbing