"As a financial risk manager it made me feel almost ill, " he says.

FORBES: Russian Roulette Investing

"I wanted to go to North Korea and because it was not yet mapped I decided to start mapping so I could at least see how easy it would be to travel within the country, " Sebastiaan van Oyen, who works as a risk manager for a financial trading firm in Sydney, told the BBC.

BBC: Google expands North Korea map coverage