DailyMail.com understands Grusch was briefed on the supposed June 1933 crash by a staffer who allegedly worked on the 'non-human' craft in a secret US government program. 'I and my colleague Alfredo Lissoni began investigating the story of the 1933 UFO crash in Lombardy in 1996, when we received some original secret documents about the case,' he told DailyMail.com. To this day, Italian historians and UFO researchers have found no other evidence of this shadowy alleged group or Marconi's involvement. Even other Italian UFO researchers have poured scorn on the story. British historian Graeme Rendall, who has written books on WWII UFO sightings, told DailyMail.com that he believes the evidence is inconclusive.