for much more time, uk keep the secret of HMS Dasher tragedy...
in WWII the HMS Dasher was sunk and nobody knew that after 30 years.
The official cause of her sinking is still doubtful. The findings of the Board of Enquiry were never released until 1972 and even now information is being withheld. This is just part of a veil of secrecy which has surrounded HMS Dasher ever since. Rescuers, survivors and witnesses - everyone with any knowledge of what befell the Dasher in these waters - all were sworn to secrecy.
see this link:
http://www.submerged.co.uk/dashertragedy.php
in the HMS Invincible is too important the silence... was a Flagship in "Corporate" Operation in 1982 and the prince of Wales aboard as pilot of helicopter.
And possibly nuclear weapons in middle of Cold War with soviet subs watching
UK goverment simply no have options to say the true to the people