A WOMAN has been rushed to hospital after suffering horrific injuries in an accident at a mushroom factory yesterday.

The 25-year-old worker is understood to have become caught in machinery at a mushroom factory in Parwan, near Bacchus Marsh, about 4pm, the Herald Sun reports.

An ambulance spokesperson said the woman suffered "multiple trauma with significant lacerations to her head and chest".

It is believed the woman may have caught her head in a machine when she was performing her duties.

Crews from CFA, SES, Ambulance Victoria and police attended the scene.

Five CFA crews were called in from Bacchus Marsh, Parwan and Eynesbury.

Bacchus Marsh CFA captain Nathan Ratcliffe was among the first to arrive and said he had prepared crews for a fairly horrific scene.

"It was fairly confronting and chaotic when we arrived," Mr Ratcliffe said.

Mr Ratcliffe said the woman had been freed by her work colleagues from the machine.

"We prepare ourselves mentally for something like that," he said.

"She was very unfortunate - it’s uncommon for this to happen to somebody."

The woman was flown to The Alfred hospital in a critical condition.

At 6.30pm, she had been listed as being in a serious but stable condition.

WorkSafe Victoria is investigating the accident. Officers attended the factory after the incident.

"At this stage we cannot speculate how it happened," a WorkSafe spokesperson said.

"The call out was made for WorkSafe to inspect the site after the relevant emergency services had arrived to airlift her to hospital. We are currently conducting a full investigation into the matter."

An ambulance spokesperson said the woman was conscious on arrival and that her injuries were quite extensive.

"Mobile Intensive Care Ambulance (MICA) paramedics and an air ambulance were also called because she was so badly injured," the spokesperson said.

Read more at the Herald Sun.