The way they seem to move around in the jungle without a sound may be unnatural to most. But for people who stay and make their living in the jungle for years, its almost a piece of cake. Even soldiers who are trained in jungle warfare knows that it really helps to be able to move like that, and that is why jungle armies try to equip them with this skill.

The whispers may be just hallucinations. *shrug* but I once read a book (fictional) that propose that ions (both positive and negative) can mess with one's brain in great concentration (either just positive or just negative - no mix). Couple that with the electro-magnetic machine in the hatch. hmmm... just makes me wonder.