National Geographic Alien Invasion 2013 part 6 - Final

Find out in Alien Invasion as some of America's top scientific experts come together to explore the effect on mankind that contact with an advanced alien race could have. In this one-off special learn how astrophysicists, weapon designers, military strategists, biologists and anthropologists are preparing for a real alien invasion and the plan for mankind to fight back. nasa

NINE MONTHS AFTER CONTACT
Astro-biologists say that humans would be more in danger from alien bacteria, and germ warfare has no effect. But, what if the aliens are not biological...simply machines?

In the case of non-biological attackers, there is one low-tech weapon that may be a match for the best technology of intergalactic invaders: a balloon. This unlikely weapon could be a game-changer. A balloon is so low-tech that it could be nearly invisible.

Around the world, a coordinated balloon assault armed with high explosives and scavenged military bombs is underway. Throughout history, low tech assaults regularly succeed against superior technology.

A human victory over alien technology may have less to do with tactics, and more to do with the human spirit - as it's evolved over 200,000 years.