Remarkable Events in the Knee Region and Abnormal Behaviour in EAS Data

We investigate the consequences of the diquark breaking mechanism near the Knee region on remarkable events coplanar emission, different conversion of visible energy to primary energy, multicluster production. The general threshold of 8 PeV for coplanar emission (estimated from classical multipro duction) could be reduced to 3-4 PeV in coincidence with the Knee. At higher energy, the complete suppression of the leading particle effect could explain the disapp earance of fragmentation region of very high energy γ 's in EAS at mountain altitude. It could also explain why Tmax levels off between 3 PeV and 100 PeV.