Ralph Nader set the world record for campaign speeches in one day (21 speeches) during this past election. The American media didn't cover it, but the Chinese media sure did.

The media's job isn't to report news, it's to report news that makes ratings and help out the people who support it. If you want something covered up, it is quite possible, especially in an enclosed (i.e. nearly unassailable) position with lots of threatening power (more scientists work for you, more gruntworkers, more executives). That's something the military has.