Criminal behaviour by staff, including theft and illegal drugs, went largely unchallenged at Wales' largest hospital, a report has found.
An "atmosphere of fear" in the surgical department of University Hospital of Wales meant staff did not raise concerns.
The report by Cardiff and Vale health board also found anaesthetic practitioners were not always in theatre for the whole operation, but instead were in the anaesthetic room on their phones or watching Netflix.
The health board apologised, saying it had taken action and implemented improvements, but also confirmed a separate review was under way into allegations staff allowed members of the public into the operating theatre to watch surgery.
Behaviour of surgery staff largely went unaddressed as some said they often worked through their breaks, so needed to take food and drink into the anaesthetic room.
It found staff felt belittled and there was a culture where swearing and outright criminal behaviour – including theft and illegal drugs found in a staff locker – went unchallenged.
