Electric Fences

Lore & Background

The reliance on electric fences proved fatal during the catastrophic events of 1989. Dennis Nedry, a systems engineer and chief computer programmer at InGen, activated a backdoor he had written into the park's software to disable security systems while stealing frozen embryos for Lewis Dodgson of Biosyn. This sabotage immediately disabled the electric fences around the park's enclosures, allowing most of the dinosaurs to escape their containment. The failure was not merely mechanical but systemic; when Nedry cut power, the fences became inert lines rather than lethal barriers. Furthermore, the incident highlighted that certain species possessed intelligence surpassing the designers' expectations. While touring the raptor pen, Alan Grant realized the animals were actively testing the fences for weaknesses and following a unique hunting strategy, suggesting they understood the mechanics of their containment.

In Their Own Story

Rain lashed against the tour vehicles as the main power grid failed, leaving the group stranded next to the Tyrannosaurus rex enclosure. The electric fence that had stood as an impenetrable wall moments before was now dead. A Tyrannosaurus rex broke through the depowered electric fence and attacked the tour group. Before the attack could fully commence, Ed Regis ran out of the car in fear. As Tim got out to close the door, the Tyrannosaurus noticed him and attacked his car. The animal's ability to breach the perimeter was confirmed when it threw the vehicle off the road. Later, in the sauropod paddock, Muldoon and Gennaro found the tyrannosaur near the jungle river. Muldoon shot it with a large tranquilizer dart, but there was no observable effect as it charged at their jeep, forcing them to escape. The failure of the fence allowed these predators to roam freely, turning the park into an open hunting ground.

Reader's Guide

The electric fence system is managed via a centralized computer interface in the main control center, where operators monitor motion sensor tracking systems and Poisson distribution graphs of dinosaur populations. Under normal conditions, massive generators maintain a lethal current across all enclosures, including the raptor pens and herbivore paddocks. The system includes safety protocols allowing for sector-specific isolation or total power cuts during emergencies, though such actions carry immense risk. When Dennis Nedry disabled the security systems, he effectively neutralized the entire network, proving that the fence's efficacy is tied directly to software integrity and generator function. Without the constant flow of electricity, the barrier offers no physical resistance, as demonstrated when the Tyrannosaurus rex easily crossed the depowered perimeter.

Did You Know?

• Dennis Nedry disabled the electric fences by activating a backdoor he wrote into the park's software.
• Alan Grant observed that raptors were testing the fences for weaknesses rather than simply trying to break through them.
• The Tyrannosaurus rex was able to break through the electric fence only after it had been depowered during the system failure.
• Motion sensor tracking systems in the control room allowed staff to view all park animals, but relied on the same power grid as the fences.