The Good
The writers got a lot of things right:
- The sundial calendar. Having a way to mark the seasons is as old as civilization, and tracking the motion of the sun has been a proven method. In the movie he used a stick to mark the sunlight entering a hole in a cave; placing the stick at the furthest point every day will give you a figure-8 path with the solstices at the ends of the loops and the equinoxes at the point where the loops meet in the center. You can reproduce this with the shadow of a fixed object, like the gnomon of a sundial.
- Seasonal tides. The reason for tracking the passing of the months was to predict the highest and lowest tides of the year, as well as seasonal changes in weather patterns. This is important for trying to escape from an island, but would also be good information if you're living on a seacoast and foraging the tidal flats for food.
- Food. Yes, coconuts are edible and yes, the “milk” is a laxative. They did a good job of showing how to get fish from the shallows but not much else in the way of food.
- Fiber craft. Binding things together is important and the use of strips of bark, woven together to make cordage, was well done.
- “Found” items. Some debris from the plane crash washed ashore and he made good use of most of what he found. It was a good plot device to give him a few pieces of steel to use as tools so he wouldn't have to work with stone implements.
- First aid. Coral is sharp and he gashes his leg while fishing. The movie portrayed fairly well how much untreated wounds would suck.
- Isolation. His mental health took a hit from the isolation and the movie did a good job of showing that. Most people are not prepared to be alone for long periods of time; after all, we are social animals.
The Bad
Not everything was perfect. My wife
refuses to watch movies involving wars with me because I point out
historical inaccuracies, and I was told to shut up a couple of times
during Cast Away because I was talking to the TV too much.
Artistic license and dramatic effect won out over common sense
several times:
- The life raft. After escaping a
sinking airplane, the main character floats to a small island in an
inflatable life raft, which he then basically ignores. Scenes with
him trying to collect rain water with leaves and improvised
containers seemed ludicrous to me when he had a soft-sided plastic
container (the raft) capable of catching and holding rain water. Even
if deflated, the raft could be placed in a hole in the ground and
used as a liner. The raft in the movie was about 6 foot in diameter
and a foot deep. That gives a surface area of 18.85 square feet, so one inch of rain fall would deposit roughly 11.75 gallons of fresh water into
the raft*. That's enough water for a week at least. Completely full, it would hold well over 100 gallons!
*18.85 sq ft = 2714.4 sq inches, for volume multiply by the 1 inch of rain to get 2714.4 cubic inches of water. There are 231 cubic inches in a gallon, so divide 2714.4 by 231 to get 11.75 gallons.
- Making fire. OK, he's not a Boy Scout and has had no survival training. Using friction as a way to start a fire is slow and tedious, which is why we suggest having more than one way to start a fire in any bag. I keep a small fire-starting bar on my keychain and have matches and a couple of other methods in my go bags.
- The island. From the few wide shots shown, the island looked to be at least 100 acres in size, maybe a few hundred, but they never showed much beyond where he originally landed. Exploration and learning what resources are available would be high on my list of activities. It was a volcanic island, like most in the Pacific, so there would have been deposits of useful rocks and several other things worth finding. Islands also tend to have a “leeward” side where the weather and waves aren't as rough. Not relocating to a better location wasn't explained. Periodic searches for new flotsam on the shore would be on my list as well.
- Food. No attempt was made to cultivate food. Finding edible plants and relocating or planting them closer to where you live is more efficient. You can still go out and scavenge for food, but having a known supply frees up time to do other things. Surviving on just fish and coconuts would leave some gaps in the nutrients needed to stay healthy, too.
- Lack of improvements. Maybe they were trying to emphasize the “desert island” theme, but after having spent a couple of years there, I would have expected some sort of improvement in living quarters, food and water storage, and organization of supplies. Firewood stacked for a rainy day, any form of container better than empty coconuts for keeping water, an outhouse, or maybe a decent shelter to get out of the elements, some kind of improvement of how you're living.
All in all, Cast Away is not a horrible movie. I use
shows like this to make me think about how I'd do things given the
same setting, with the knowledge that Hollywood has different laws of
physics than the real world. Let me know if you've seen this one or
if you have a favorite of your own that you'd like to share; I'm open
to suggestions for new entertainment.
