Yes the figure was given to me, by someone who should have not but what ever it is not envisage these carriers coming in range of a hot war, thier AA/Am protection is quite small relying instead of a support force. Also yes the last major vessel which underwent the shock trials was Invincible, but the new carriers are cheap and nasty builds, you can see that just looking at them. I would imagine as a retired professional seaman that, in a mid ocean storm they would be very uncomfortable especially when the waves smash under the square out hanging of the hull. But now the Russians and Chinese have no need to get within range of the F35's, their new supersonic missiles would take them out quite easily, as their kinetic energy as such would have the effect of a small nuclear weapon. Plus China has for several years had a anti ship missile of 7.5 tons which has a range of 1600 miles , it goes out to the outer atmosphere and then hurtles vertically downwards at considerable speed, it was designed to take out the USA large nuk carriers.