Detectives have allegedly uncovered thousands of new graphic images on a hard drive seized from a doctor charged with secretly recording colleagues in hospital bathrooms.

Ryan Cho, 27, has been rearrested and had his bail revoked today after police cracked a meticulously organised hard drive.

Forensics found more than 4500 intimate videos allegedly secretly recorded in showers and hospital toilets between 2021 and 2025, Senior Constable Narelle Baker told the Melbourne Magistrates’ Court.

They were found inside folders named after three hospitals, their bathrooms and hundreds of alleged victims.

The majority are female doctors, nurses and paramedics who used staff facilities at the Austin Hospital, the Royal Melbourne and Peter MacCallum Cancer Centre.

There were also videos allegedly filmed inside homes.

Evidence in court described the alleged actions as “calculated and obsessed”.

“He devoted an enormous amount of time to keeping his colleagues under surveillance, tampering with toilets to draw his victims into cubicles where devices were set up,” Senior Constable Neral Baykun said. 

Police alleged they have video of Cho setting up one of the cameras at the Austin Hospital from a phone found by security in a bathroom on July 7.

The phone was in a mesh bag hanging from a white hook that was not installed by the hospital.

A sweep in the hospital has since found more of those same hooks on other floors and in other bathrooms accessible to patients.

Five alleged victims have been formally identified.

Police do not have any evidence that the videos have been shared, but Cho has refused to provide passwords to multiple devices.

The Singaporean national arrived in Australia in 2017 to study at Monash University.

His medical registration has been suspended, and police say more charges will be laid as more of his alleged victims are identified.

Cho is now behind bars after his bail was revoked today despite his parents flying from Singapore to provide a $10,000 surety.

But his lawyers say he could appeal the decision.

“We’re unable to comment in relation to the allegations, but at this stage, he has options,” defence lawyer George Balot said.

“He might appeal to the Supreme Court.”