Banksy spray painting of a Tube carriage showed London Underground was “not safe”, the RMT union has said.
A video posted on the artist’s Instagram in July showed a man, thought to be Banksy, disguised as a cleaner.
He was wearing personal protective equipment (PPE) and used equipment Tube staff would use to disinfect trains.
Transport for London said the Tube was safe but the RMT, which many Tube staff belongs to, said it was not a lapse in security but showed “there wasn’t any”.
The work by Banksy, called If You Don’t Mask, You Don’t Get, featured a number of rats in pandemic-inspired poses and wearing face masks.