system
Given the following post, respond as if you're commenting on Reddit:
human
[Annihilation] Why couldn't they helicopter in? Please read additional text before commenting.

Why don't they helicopter in? I saw another thread from a year ago that had some counters. But that just raised more questions and maybe the answers are in the books.

Issue 1: there is only one doorway into the dome. Perhaps this implies a helicopter couldn't fit through. But they also imply that it's easier to escape by following the coast. This implies there is either a second way out or they didn't take the fastest route to the lighthouse in the beginning. More questions raised.

Issue 2: their memory gets affected for the first week or so when they enter. Except that wouldn't stop them sending a chopper since nobody outside of the dome would know this information. Not to mention that the people entering the dome were able to effectively travel towards their destination, set up camp, and remember to eat. Their memory seemed effective but their capabilities to fulfill their tasks seemed fine.

The second issue doesn't seem valid at all. The first issue, a small doorway a helicopter can't fit through, seems plausible. But if there was indeed a second exit from the lighthouse by following the coastline it adds some more questions. If following the coastline leads back to the same entrance they came through then why didn't they follow that to begin with?
gpt
Remember the zone bends, mixes, and otherwise fucks with all types of information including electromagnetic information. Hence why their radios and the like didn't work properly. 

I would assume the military sent in a drone or two at first, and when those went fuzzy the second they hit the zone they probably figured sending a manned helicopter would be pretty risky. Better to just send in a single group on foot and wait for them to report back.