What happened to HMS Thetis in 1939

A look at the detail of this tragedy, trying to clear up a few common misunderstandings, explain some of the mysteries.
HMS Thetis sank during dive trials while carrying a full crew, other naval personnel and a large number of shipyard workers. Only 4 men made it out, despite her stern being above the surface, and rescuers present. Various accounts get some of the details wrong, which are then perpetuated, this is an attempt to explain some of the detail relating to events on board. It does not go into detail about the rescue effort nor the subsequent investigations and legal cases. The finger-pointing and arse-covering began before the bodies were recovered.

Видео What happened to HMS Thetis in 1939 канала Sean D