A British homeowner has accidentally unearthed a WWII air raid shelter under his driveway in Luton.Thirty-seven-year-old Simon Marks was unsure what had happened when the wheel of his car got stuck outside his home. When he got out to check, he discovered part of the driveway had caved in.As he cleared the hole out (having initially dropped a camera on a selfie stick down the hole to check it out) he discovered a two-roomed shelter.