help with "doom" level, shields.

[arlaharen]

I've rescued jan and been making my way to the shields. I get the security key in the cylinder shaped structure in the middle, but then what? Can't find the door anywhere. Where is it?

Thanks!

[flashcrw]

When u get the key, go back over the big pipe and take the second door from the left. Here u will find a locked door where u need that security key. Open door and push the button. the rest is pretty self-explain.