Independence Day

They disable the destroyers by uploading a computer virus into the mother ship, which is blown up with a nuke.

The Green Flame Torch

Factual error: There is a shot of the Imperial Valley at night with the edges of the Los Angeles destroyer spinning over the mountains. The center of the destroyer is hovering over downtown LA. Imperial Valley is over 200 miles away from downtown LA, and the destroyer is no more than 20 miles in diameter. There would be no way the edges of the destroyer would extend far enough to be seen from Imperial Valley as shown unless it was over 100 miles in radius. The ship does not even hover over Steven Hiller's house which is in LA, it can nearly be seen whole from there. The destroyer would be obscured by the mountains and from 200 miles it would appear much smaller.

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President Thomas Whitmore: I don't understand, where does all this come from? How do you get funding for something like this?
Julius Levinson: You don't actually think they spend $20,000 on a hammer, $30,000 on a toilet seat do you?

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Trivia: According to the Director's commentary, Twentieth Century Fox Film Corporation did not want the film to be released under the title "Independence Day" to avoid legal complications (specifics weren't disclosed as to what the problems might be, but it's also why the abbreviation "ID4" was used). Roland Emmerich (director/writer) and Dean Devlin (writer) needed to justify the title, so they added the rousing bit right at the end of President Whitmore's speech at the hangar when he ends with, "The 4th of July will no longer be known as an American holiday...today we celebrate our Independence Day!"

Super Grover

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Question: It's been shown in the film the the aliens are technologically more advanced than us. Then, how come, with all their technology, they were unable to defend themselves from something as simple as a computer virus?

Socks1000

Answer: Remember that the aliens had to interface with our satellite computer code first...David simply "reverse engineered" the code to create the virus. When it was uploaded, they didn't have enough time to combat it.

Answer: It was also a bit of a tribute to "War of the Worlds", in which the alien invaders with much more advanced technology ultimately succumbed to ordinary terrestrial pathogens in the original novel by H. G. Wells as well as its many screen adaptations.

zendaddy621

Chosen answer: Its supposed to be an exercise in demonstrating how the aliens underestimated their opponent, but in reality it's merely a convenient plot device.

GalahadFairlight

Answer: I was wondering the same thing. Since the Harvesters had our satellites meant they could eavesdrop on every single conversation. David and other people in the facility probably put up a firewall on the computers and cameras, so that the aliens couldn't see or hear what they were planning on doing.

Answer: Maybe there were no viruses in the planet where these aliens came from so they didn't have any countermeasures against them.

Answer: They could defend against it, hence why they bring the nuke. The virus drops the shields, and the nuke destroys The Mother Ship. David even says that the shields will be down for a few minutes.

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