For further research and analysis:

1) Possibly they are smoking some kind of bush in a pipe.

2) Possibly some sexual meaning...espionage often involves nude females.

Another msg said "I am his wife and am writing for him. I am in the bush"

3) It is possible that these people pretend to be lost hikers in the bush...who stumble upon the drill site...then gossip with drillers..try to catch a glimpse of drill cores...hang around saying they lost their mosquito repellent and granola....Then sneak off to make call with a satellite phone to a friend at the online broker account.

The 'wife in the bush' is posting here...so is online..but may feel like she is "in the bush' because there is no room service and pedicure in her remote hotel