Dr Gary Brickley, Senior Lecturer in the School of Sport and Service Management, said the 37-year-old American, treated for breast cancer just a year ago, was “incredible - I am in awe of her achievement”.
He said: “When I did my solo channel crossing in August 2016, I did actually start to wonder what it would be like to do a double channel swim. The limits of human endurance feats do astound me. I think with this one people thought that no one would be able to achieve it.
“The idea of being awake for that long seems a big struggle to most and then to be swimming in cold, dark conditions added to it puts many people off.
“Logistically, planning something like this would be tough. Typically a boat costs around £2,500 per crossing. Swimming over 50 hours like Sarah did you would expect to sweat around 25 litres and to stay hydrated you would need a similar amount to replace the losses. In this endeavour you would expect around 16-25,000 calories to be expended and although you will use some of your fat stores you would need to maintain carbohydrate and protein intake.