Medical oxygen, end of a day shift, Lewisham Hospital, London, UK on 21st March 2021 – by Jess McArdle

“I’m sending a recording that I took on 21st March after a day shift. I’m standing outside Lewisham hospital near the medical oxygen canisters. I work as a midwife on the labour ward and we’re regularly giving people gas & air (nitrous oxide) which is piped in through the walls, as is the oxygen. The canisters of medical oxygen are huge and I guess this is the sound of the gas travelling through the pipes?”