It's not long past 11am and 72 patients and 21 ambulances have already descended on the Royal Gwent hospital in Newport. Staff say it is extremely busy, but it can be even busier.
When I arrive with my camera operator, there are five ambulances outside. If the symptoms of a busy hospital had colours, they would be green and yellow.
Patients waiting outside means no space inside.
Walking through the front door I am met with a hum of activity. Staff calmly, but quickly, usher patients through double doors into the main area of the emergency department - they could give swans a run for their money.
Natalie Skyrme is a senior nurse on the department.
"A lot of these patients have been here over 12 hours. They're waiting for beds. The nursing staff are working to try and give them the care that they need", she told me.
The aim here, is flow.
Improve patient flow through a hospital and the system runs smoothly and waiting times are shorter.
It is a simple theory, but one that's proving challenging not just here, but across Wales.
Last month, just over 7,000 patients arrived at the Royal Gwent's A&E department alone.
It was its busiest January ever. 95% of patients should spend four hours or less here. In December 2018 only 63% did.
The whiteboard in the main A&E area is full - doctors and nurses continually update the status of patients.
Old technology still has a place here. If there are beds available, then staff look to move patients through the department and into wards - or better still, home.
Further into the department is the medical assessment unit (MAU). We are guided by Natalie, the senior nurse in charge. On our way she says it is extremely busy in the unit - the people lining the corridors are testament to that.
The first thing that hits you in the MAU is the noise.
Every bed, flanked by curtains - is full.
There is sometimes little privacy in a place like this. Medical staff often prefer to keep curtains open to ensure they can observe patients' conditions.
In one of the bays, watching the hive of activity around the nurses station is Danny. "The place isn't big enough" he told me. "We need more money. More money."
Just yards away, in a chair with her bags packed for home, is Kathleen. At 82, she muses how she can be among the youngest in a group of five in hospital. The elderly make up a large proportion of admissions to A&E - particularly in winter when falls become more prevalent.
Also ready to go home is Norma. She has spent three days in MAU - there hasn't been space on a ward. Admitted after a fit, she bemoans what she sees as an abuse of the service, "some are here with finger ache," she told me.
It has just gone midday. We have been filming an hour and seen dedicated staff working to deliver high quality care faced with huge demand.
Every patient is full of praise and gratitude - but you are left wondering how long hospitals can function in this way and whether grand plans of government will be able to deliver a sustainable solution.
When we leave, there are seven ambulances outside.
Watch the full report: