WHAT made this plane DIVE just before landing? | Icelandair 315 (Patreon)

A Icelandair Boeing 757 carrying 82 passengers and crew is on final approach to Oslo, in Norway. Suddenly, the plane pitches down, and begins diving straight for the ground. Pandemonium erupts on board, as the engines roar and the passengers are lifted out of their seats. The pilots are panicking - they have no idea what is happening their aircraft. Will they be able to pull it out of its terrifying plunge before time runs out? This is the story of Icelandair flight 315.