KINGOFNY

Factual error: When DeNiro scouts out the building by going inside, Ed Norton guides him via a handheld two way radio. Having been a Marine for 5 years and working with various high power communications gear, I have never seen or heard of a handheld two way radio that can talk to another radio that is underground and quite a distance away. Both of the radios were portable meaning they had small batteries powering them, not a powerful power supply. Handheld radios work on the UHF spectrum, which is line-of-sight. It is impossible for a UHF signal to reach a receiver by going through numerous walls and metal piping. Ever lose your signal on your cell phone when inside a building or tunnel? Same concept.

KINGOFNY

Factual error: When Travolta is deep down in the mine shaft, he uses a two-way radio to talk to his guys upstairs. I know from personal experience, and from being in the military that two-way radios, no matter how much power output they put out, cannot talk for more than 100 feet max in an enclosed area such a mine with thick walls, let alone 2,000 ft (the distance the elevator travels in the mine).

KINGOFNY