There is an interesting article at the DXU website, written by Wayne/N7NG, regarding DXpeditions and the fact that they always had some form of on-the-air difficulty in conducting their operations. Read the article here.
Interesting approach from the K1N team; track down those who creates DQRM (Deliberate QRM) during the expedition.
The amount and intensity of DQRM has been growing enormoysly during the last couple of years, targeting DXpeditions all over the world.
Check out the K1N page about DQRM and their DQRM Report Form: Link to K1N DQRM