the reason why everyone figured out to stay quiet so soon was because the military told them. the military had captured a few of these creatures and did tests on them. during the tests the military figured out that the creatures could not swim, are blind, and very sensitive to sound. now of course the military wanted to weaponize the creatures cause that is what the military does but nature always finds a way, right? so the creatures called to the mother ship to bring in re-enforcements and hell started to break loose. the only thing the military could do was warn the citizens about the creatures. c'est tout
Our main point is that we were disappointed we didn’t actually get to see that idea unfold on screen, considering that’s what the entire premise of the franchise hinges on.