Nedry was an idiot.

Indeed, the second half of the plan was poorly executed, and resulted in his untimely death. Why the frack would Nedry disable the electrical fences in so many areas of the park just to escape? He had to know the dangers of doing that better than most people at the park, and with the storm on the way, why not just postpone the heist to a later date.

His plan was crap too, at least in the movie version. Even if all went well (no storm, he made the ferry) Hammond and Ray Arnold were onto him and could have radioed the mainland police to arrest him at the port. The Dodson private boat plot makes more sense.

Nedry was supposed to be a wildcard idiot. He is the embodiment of Malcolm’s chaos theory.

[deleted]

He should have just turned off the security cameras, grabbed the embryos and then had one of dotsons guys parked outside the visitors center and handed him the shaving cream and then go back to the control room. Heck he even could have given the guy a Jurassic Park shirt so that he would blend in.

Speaking only on the movie, I think his plan was for the most part good, but the execution of his escape was poor, and the storm threw a variable into it that he didn't count on.

First it had to be that night, where most of the staff was leaving. That way there was hardly anybody around to interfere or catch him. Also if he managed to get on the ferry at the last minute, nobody would think much of him being there. They would probably just assume he wasn't needed that weekend either and was leaving the island for a few days. Someone else asked wouldn't Hammond and Arnold radio the ferry or the mainland. Well that's because he shut down all their communications, including phone lines. They couldn't even make calls within their own building, let alone off the island. The control room at that point was blind, deaf and mute. By the time they got back on line he would have already met his contact on the main land and probably be back on a plane to anywhere in the world.

The actual stealing of the embryos was brilliant and flawlessly executed. First he let them know he was doing some work that might cause some minor systems to flicker on and off. So that way no one would think much of it when the cameras shut off. Then timing it perfectly for when the cameras would be off, grabbing the embryos and getting out. Also he didn't just crash the whole system at once. Just one thing at a time, based on what he needed at that moment. First the cameras, then the fences, then everything else. This way no would even notice that anything was wrong, until it was too late.

Getting to the docks might be the only part that was not well planned. Did he have to go thru the park, or was that just the fastest route? Or was there more security systems that he couldn't hack into to outside the actual park. And he probably should have had the route memorized, even without signs. Granted the storm thru everything for a loop, but still if he was prepared enough it wouldn't have mattered.

Nedry’s plan was actually fool proof. He disabled the park security systems just long enough to preoccupy Hammond and Arnold, under the guise of a system update. The quickest route of reaching the East dock was through the park, which meant he had to disable a number of electrical fences. If all went as planned he would have been back in the control room within 10 minutes and restore everything to normal, and no one would be any wiser. What he didn’t account for was the severity of the storm and getting lost in the park itself.

The storm was the wild card. Nedry had to go when he did because the coolant in the cannister had a limited time before it thawed. Dead embryos = no money.

This is what he should have done, Nedry sneaks one of Dodson's guys onto the Island, gives him a Jurassic Park uniform so he blends in and everyone just assumes he's a worker. Then after everyone's done he only deactivates the security cameras, takes the embryo's like he did in the film, then goes to the front door, passes them off to Dodson's guy who then gives him a Coke so his alibi works, and Dodson's guy gets off the Island in his own boat that he brought. No need to deactivate fences and no one would be able to figure out it was Nedry who took the embryo's assuming they noticed the difference.