HenryVIII,
if it happens in the middle of the ocean also the "maintain VMC and land at the nearest suitable airport" rule goes out the window, and be sure that if you do find a VMC airport "within hours" you will surely be intercepted well before you start the descent checklist....
If you are unlucky enough to lose radio coms on the top of the Himalayas you can be 100% sure you'll be in good company in matter of minutes since the Himalayan mountain range stetches across hot spots like Afghanistan,Pakistan,India and China......
