The UK's newest, and largest, hospital facility has taken in its first coronavirus patients needing intensive care treatment.
East London's ExCeL exhibition centre, which normally plays host to lifestyle shows, expos and conferences, has been converted into the temporary NHS Nightingale hospital, with space for 4,000 beds.
In nine days, the 87,328 square metres of double exhibition halls have been fitted out with the framework for about 80 wards, each with 42 beds. Some 500 fully-equipped beds, with oxygen and ventilators, are already in place and there is space for another 3,500.
If it did reach capacity, it would be one of the largest hospitals in the world.
Each ward is named after a different British doctor, nurse or other medical professional.
The first two wards to open will be named Lady Harriett Acland and Ethel Bedford-Fenwick after two nurses whose work in the 18th and 19th centuries paved the way for modern nursing.
How was it built?
The facility, which was officially opened on 3 April, was built with the help of up to 200 soldiers a day from the Royal Anglian Regiment and Royal Gurkha Rifles, working long shifts alongside NHS staff and contractors.
Timelapse video of NHS Nightingale being built
Architects and engineers from BDP, the firm that helped convert the centre, were part of the planning team given the task of creating the life-saving facility.
BDP Principal James Hepburn said the scale and timeframe for the construction were unlike previous healthcare projects and architects were coming up with designs almost as building needed to get under way.
The framework for individual bed bays were made from material usually used to make exhibition stands - because it is lightweight and could be constructed quickly.
Mr Hepburn said the three main challenges were:
- Speed of the construction and what to build it out of
- Having a reliable electrical supply - for life-saving ventilators and equipment
- And being able to get medical gases to each of the beds
ExCeL's existing electrical infrastructure has been modified to ensure the power supply can cope with demand - and not cut out. Temporary generators and oxygen tanks, to supply the beds, have also been installed.
Mr Hepburn said his team has drawn up an instruction manual to share with other countries taking on similar emergency projects - and people in Australia and Canada have already contacted them.
Where will the staff come from?
The ExCeL centre's suitability for the hospital site goes beyond the functional characteristics of the building.
It is served by public transport links. The nearby London City Airport can be used to bring in supplies and equipment and there is also hotel and university accommodation close by - should it be needed.
It will be led by a team of eight senior staff, drawn from local hospitals and trusts. At capacity, the hospital will need 16,000 staff to keep it running. That will include thousands of doctors, nurses and volunteers.
"The numbers are scary," chief operating officer Natalie Forrest said. "To run one ward, including all of our ancillary staff, we need 200 members of staff."
The nursing staff is being drawn from other hospitals, as well as volunteers from St John Ambulance. Airline staff from Easyjet and Virgin Atlantic have also been approached.
Cabin crews have security clearance and many of them are also first aid-trained. The NHS says they would be changing beds, helping doctors and nurses on the wards, and performing other non-clinical tasks.
It is not a conventional walk-in hospital - only patients already on ventilators will be admitted, transferred from other intensive care units across London. They will stay at the hospital until their course of ventilation is finished.
Support services such as pharmacies and therapy treatment are also be available.
And a mortuary is also included in the NHS Nightingale design. Additional mortuary space is also being found elsewhere in the city, including Wanstead Flats in the Manor Park area of Newham, local residents have been told.
Other temporary morgues are also being set up around the UK, including at an ice rink in Milton Keynes, a crematorium in Ruislip, and at Birmingham Airport, where the hangar facility will initially have space for 1,500 bodies "but will expand to hold more".
Where are the other NHS Nightingales?
Work is already underway to expand the NHS Nightingale-style hospitals beyond London to ease pressures on regional NHS services.
Conference centres in Birmingham, Manchester and Harrogate have been transformed into NHS Nightingale hospitals over the past few weeks to serve the midlands and north of England.
Work is also underway in Glasgow and at the University of West England (UWE) in Bristol to create temporary emergency hospital sites.
Scotland's emergency facility at the SEC in Glasgow will be named NHS Louisa Jordan, after a nurse who died from typhus while serving in Serbia during an outbreak in 1915.
Belfast City Hospital's tower block has been transformed into Northern Ireland's first Nightingale hospital - a 230-bed unit staffed by a team drawn from across Northern Ireland.
An extra 6,000 beds are also being set up in Wales - many in sports and leisure facilities - to take the pressure off hospitals during the coronavirus pandemic.
Among them is the Principality Stadium, in Cardiff, the national stadium of Wales, with capacity for up to 2,000 beds, if needed.