Help!!!

[Banksy]

I am a noob on Half Life 2 and i am stuck on the Kanal bit where i come out of the tunel from that see saw and then the is a helicopter shooting a large amount of builets. I have been through the blue door but that doesn't get me any where, can any one tell me what to do???

 

[Yoksta]

The kanal basically u need to jump over the trucks on the opposite side of the blue door, ( in the open where the coptor is) carry on going down there and ure get a boat thing which u take 2 the black mesa east)