Even within a hospital, the ICU can feel like another world. But critical care goes far beyond simply keeping people alive – it’s also about what happens next

In early March, Mike Brunner, an intensive care doctor at Northwick Park hospital in north London, saw his first few Covid-19 patients. They were arriving with mild coughs, but just hours later were relying on oxygen tanks to breathe, their lungs on the brink of collapse. Within days, three patients became seven, then 20, and from then on, said Brunner, “we were in it”.

For a while, Brunner felt as if he and his colleagues were the only ones who saw the huge change coming. “We could see this tsunami of people coming at us, and yet nobody else did,” said Brunner. Driving through London on his way to work, past people crowded together in shops and pubs and cafes, he felt as if no one understood that very soon life was not going to be the same. “It was an incredibly lonely feeling,” he said.