Russia stated in her official MAK Report concerning the Air Crash at Smolensk on 10th April 2010, in which all 96 people on board including the Polish President Lech Kaczynski died, that this was due to pilot error under Presidential pressure: this has been accepted by the world apart from many Free Poles and is now the history. However her analysis is inherently flawed so must be rejected because her accident hypo-thesis is incompatible with the evidence presented in her very report. This book is based solely on this evidence, which are the public, undisputed and relevant facts, hence the official ones as the world has accepted these; analysing these arrives at a different historical explanation, namely that this was a planned, cold-blooded, group murder by Putin's Russia, who destroyed the plane by bombs. A new variant of the bomb hypo-thesis is presented here, namely the engineering bomb hypo-thesis, which is the only one that fits the facts, hence is the history of this air crash, in particular that the plane was on the correct flight path, hence its left wingtip fell to its left, and that it slewed not swerved leftwards across Kutosov Street. Subsequently Russia covered up this group murder, so an International Commission should be convened to analyse this Air Crash.