A doctor in Sweden has been accused of drugging and raping a woman he'd been keeping in an underground bunker. 

The doctor is alleged to have drugged the 38-year-old woman with Rohypnol-laced strawberries in Stockholm before driving her more than 550 kilometres to the bunker in Kristianstad, in the south of Sweden.

Masks found in the home of a Swedish doctor accused of drugging, kidnapping and raping a woman he later held captive in a dungeon. Photo: Swedish Police Authority

The doctor, who is also aged 38 but who has not been named by Swedish prosecutors, had worn rubber masks of bearded and elderly men during the journey to avoid being recognised.

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In echoes of Josef​ Fritzl, the Austrian who kept his own daughter locked up for 24 years, the doctor is alleged to have held the woman in the 60-square metre dungeon for a week.

Prosecutors allege the doctor had taken the woman "to be his girlfriend", Swedish newspaper Kvallsposten reported.

Swedish police photos taken inside the bunker. Photo: Swedish Police Authority

The newspaper reported that the doctor was a "very unhappy man. He has no girlfriend. He has built this building, then he has taken a person to be his girlfriend."

However, police said he later panicked and drove her to a police station in Stockholm after he found out she had been reported missing. 

They said the doctor had spent several years building the concrete dungeon, which he had equipped with a kitchen, toilet and bedroom. The dungeon was also sound-proof and light-proof, and double security doors with heavy latches and code locks were at the entrance.

The accused doctor allegedly wore masks as he drove the woman to a dungeon he had spent years building. Photo: Swedish Police Authority

When police searched the dungeon, they allegedly found a simple Ikea pine bed, a desk and a kitchen area with a sink and hot plate, Swedish news website Aftonbladet reported. A fridge stocked with fresh food was also in the dungeon.

Police believe the man may have planned to kidnap other women as well, according to British newspaper reports, which quote Aftonbladet.

Fritzl was jailed for life in 2009 for the murder of a baby he fathered with his daughter during the 24 years he kept her locked in a cellar.

A strawberry stem that Swedish police allege has traces of Rohypnol, the drug they say the man used to drug his victim. Photo: Swedish Police Authority

He was also convicted of slavery, and admitted charges of rape, false imprisonment, incest and coercion.

Fairfax Media