Sinking of HMS Dasher still a mystery after 70 years

It's the barely-known disaster which claimed the lives of four Birmingham seamen at the height of the Second World War.

But the sinking of HMS Dasher is still at the centre of mystery and intrigue, 70 years later.

A total of 379 lives were lost when the aircraft carrier went down in just eight minutes off the coast of Scotland on March 27, 1943.

The tragedy was put down to an explosion caused by petrol fumes igniting....