Managers at Plymouth's Derriford Hospital have been ordered to make urgent improvements to protect patients.
It follows an unannounced inspection which found that surgical staff were under such pressure that patient safety was at risk.
It's the second time in recent years that the Care Quality Commission has taken action against the hospital trust.
More top news
A ex-serviceman who was attempting to swim across the Atlantic Ocean has been left partially paralysed, after being stung by a jellyfish.
She has been using a paramotor to fly across the world in the hope of discovering why numbers of swans migrating to the UK have halved.
Police, businesses and experts are holding a cyber crime conference today. Only 1 in ten crimes are reported to police.