Cryostasis Level 12

[arctic]

Hi,
I'm new here.

Can anyone help. I am stuck on level 12. Af´ter the chat with the helicopter pilot, then shooting the morons trying to destroy the lights, i finally end up in some kind of hanger, with a door. Once inside some large creep with headlights for ears blasts like mad. I have pumped all my ammo into this creep and he still wont die. Whats the secret????

Ok, sorry got him this time, (F5 quick save before he returns LOL) now the flying ants are a pain in the butt