Dubbed the "Swedish Fritzl", he had planned to hold her captive in the purpose-built bunker for years.
The 38-year-old abducted his victim after meeting her for a date in Stockholm last September.
Arriving at her home with champagne and gifts, he drugged her with Rohypnol-laced strawberries dipped in chocolate before kidnapping her.
He used a wheelchair to transport her as well as two rubber masks, of a bearded man and an older woman, to hide their identities, driving her about 350 miles (560km) to his home near Kristianstad in southern Sweden, prosecutors said.
He held her in a soundproofed cell at his home.
The case compared with that of Austrian Josef Fritzl, who kept his daughter locked up in a cellar for 24 years.
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