HELP!! On the Wii - Double agent - when in the JBA Headquarters prt 2 - I need to sample the red mercury but when I do the door closes and the gas released kills me. It says I need someone to come in but on solo mission there is no one.
PLease help

Here's a clip from a walkthrough I found:

After you access the mercury, Sam will get doused with harmful gas and needs to escape. Use the VENT near the door and open it to get out. Now exit this room and make a right turn. Go around the corner and enter the next area.

You just have to escape before Sam dies...

There is a vent at the top of the shelves to the right of the door. You need to climb on the shelves using the small box on the right hand side. It works best if you locate the vent by looking at it from the outside of the chemical chamber before sampling the gas. You will need to crawl through the vent similar to crawling through a crawl space.