Five years on, Senior Sister Lauren Jakes still vividly remembers the moment she was told her ward was to expect the arrival of its very first Covid patient.
"You could see the fear in everybody's eyes," she says.
As the pandemic unfolded, the Norfolk and Norwich University Hospital became a dedicated surge centre, taking seriously ill patients from across the East of England.
Since then, SisterJakes says she has lost a "very good number" of nurses to other departments, as they could no longer face working in critical care.