Inside Old Trafford tunnel after Man City-Man Utd clash
It is the scene of some of the most iconic moments in the recent history of English football – Pizzagate, numerous title celebrations and countless Fergie tantrums. But on Sunday a new chapter was written into the folklore of the Old Trafford tunnel.
In the immediate aftermath of Manchester City's 2-1 victory over rivals Man United, a 20-man brawl broke out, leaving Mikel Arteta bleeding from the head and the eyes of the sporting world on the bowels of the 75,000-seater stadium once more.
But what makes the Old Trafford tunnel such an epicentre for controversy? Here Sportsmail takes you inside...
The tunnel at Old Trafford has hosted a number of controversial incidents in recent years
Manchester City and Manchester United players clashed there on Sunday after the derby
Before matches, United and the away side line up next to each other in the sloped tunnel
The away dressing room at Old Trafford, where Jose Mourinho interrupted City's celebrations
While most tunnels across the Premier League sit on the halfway line, at Manchester United it is situated in the south west of the ground.
That alone can add extra spice to any occasion. Opposition players must head past the famous Stretford End when emerging and returning down to the dressing rooms.
Both managers, meanwhile, must face the wrath (or enjoy the support) of fans in the South Stand as they make their way along the touchline to the dugouts.
While the game is being played, however, the south west corner of the ground looks like any other. It is only before kick-off, half-time and full-time that the giant red plastic tunnel from which the players enter the pitch is wheeled into position.
Leroy Sane shared a picture of the Manchester City players celebrating in the changing room
Kyle Walker and Co walk back up the ramp before turning left to reach the two dressing rooms
City goalkeeper Ederson confronted the Manchester United manager in the tunnel on Sunday
When the players do head off the pitch, they walk up a short ramp before turning left towards the dressing rooms. After passing through a set of doors, they walk down a cramped corridor, no more than 8ft wide.
Around 15 metres down the walkway sits, on their right, the away dressing room. It is in here that visiting players go through their preparations in a large, open-plan room complete with adjoined shower room.
Another 10 metres or so further along the corridor is the home dressing room that features its own tactics boards and television screens.
Though United enjoy a slightly larger changing area than the visiting teams, the two dressing rooms sit on the same side of the corridor and are barely a short pass away from each other.
It is from there that the two sides head into the tunnel, where they line up alongside each other ahead of kick off.
Just hours earlier, United and City's players had entered the ground via a large set of metal doors at the top of the ramp in good spirits, if not on wholly good terms.
Ahead of kick off, Guardiola and Co entered the ground via doors at the top of the tunnel ramp
City coach and former Arsenal midfielder Mikel Arteta was left with a cut head after the fracas
The United players emerge from the corridor in the tunnel to join City in the tunnel on Sunday
The two sides walked down the sloped tunnel towards the Old Trafford pitch before kick off
Opposite the entrance to that corridor, too, is the interview area where Jose Mourinho and Pep Guardiola spoke to TV crews shortly after the final whistle.
On Sunday, Mourinho would have had to walk past the City dressing room to speak to reporters. It was while heading up that walkway that the United manager confronted the triumphant City team after hearing music blaring from their camp.
After demanding they show 'more respect,' the Portuguese was confronted by City goalkeeper Ederson. The two were involved in a heated exchange and United players followed their manager into the corridor, prompting the fracas
Mourinho had water squirted at him, was doused in milk and was hit on the head by an empty plastic bottle, while witnesses said some players tried to swing punches as police looked on in disbelief.
After security officers managed to separate the 20-or-so players and staff involved in the fracas, police stood outside the two dressing rooms.
The shocking scenes came 13 years and two months on from Pizzagate, when a heated battle between United and Arsenal ended with players scrapping and Sir Alex Ferguson being hit on the head by a slice thrown by Cesc Fabregas.