John Graham says he stumbled across a German World War II submarine invading Britian to capture digital television decoders.

Do you believe him?

You shouldn't.

The 69-year-old was named the "world's biggest liar" during the annual competition, which draws tourists and competitors from around the world, held in Santon Bridge.

Click here to read the AFP report.

Graham has won the title five times before.

Each competitor gets five minutes to tell their story.

Material from AFP contributed to this report.