An electrical company has been fined after a mother was dragged to her death in the shutter door mechanism of an underground car park in Cambridge.
Social worker Heidi Chalkley, 40, was heading on a night out when she grabbed hold of the rising door after asking her friend: "Have you ever held on to it as it goes up?," an inquest heard last year.
She panicked as her hands got trapped and was pulled into the machinery and crushed on August 14 2016, the hearing in Huntingdon was told.
She died at the scene of multiple injuries.
An investigation by the Health and Safety Executive (HSE) found the sensors at the top of the door, which should have stopped it, were incorrectly wired and no longer functioned as the door opened.
The HSE said BS Graves (Electrical) Limited had carried out work on the roller shutter door at Ruth Bagnall Court since 2012.
It said this included an inspection a month before the incident, but the company did not check the operation of safety sensors and failed to identify the fault.
BS Graves (Electrical) Limited of Rushmere Close, Ramsey, Cambridgeshire, pleaded guilty at Peterborough Magistrates' Court to breaching Section 3(1) of the Health & Safety at Work etc Act 1974 and was fined £25,000 and ordered to pay costs of £6,500.