just been playing the game XIII, really like it.
but there is a level which i just cannot complete

it is the level with this military base with lots of green tents, and where i have to put a tiny microphone into some device.... inside the big beige tent (jungle setting, south america i think).
i killed all guards and hid the bodies behing green tents, but always when i put the micro in the phone, immediately in the very same second the alarm starts.....
maybe someone has an idea what i did wrong?

---loki