The nuclear proliferation debate has been pretty much omni-present in the news for the past few years. I was delighted to see North Korea change their stance on the admittance of IAEA inspectors. While I don't think the nuclear question in Korea is going to be solved in a hurry, I do think it's an important step forward.
Unfortunately this improvement in relations has coincided with further complications in Iran, where satellite images suggest a large tunnel is being built next to a key nuclear complex. A tunnel based nuclear complex would greatly reduce the impact of a preemptive air strike against the state's burgeoning nuclear capabilities.
It is still to be established whether there is need for military action against Iran (at present you would have to say no), but if this tunnel complex is for nuclear development purposes, maybe they do have something to hide.