It was an air disaster that crippled a country, heightened tensions between two nations, and ignited conspiracy theories worldwide. On April 10, 2010, Polish Air Force Tupolev Tu-154M, carrying Poland's president, Lech Kaczynski, crashed on Russian soil, killing everyone aboard. Russian experts pinned the blame on the pilots, but Poland's Interior Minister examined the evidence and reached a far different conclusion. Experience the tragedy that shocked the world and follow the investigation that remains steeped in controversy.