Measuring Devices

When the expeditions go into Area X they are given monitoring boxes that they wear on their belts. Supposedly, these black boxes will tell them when there is danger. They are told that if the boxes flash red, then they are to move to a safer zone. However, later, the biologist learns from the psychologist that they are simply placebos and don't really measure anything.

Lighthouse

The lighthouse represents safety, but it is a false sense of safety, as the biologist finds out. The psychologist tells them that the lighthouse is an extraction point, that it is where all of the other expeditions met to leave. However, when the biologist gets there she sees the evidence indicating horrible and prolonged violence.

Additionally, the lighthouse represents the old civilization which is giving way to the new order of life that is developing in Area X. Nature...