hey Im on xbox 360, in the blue line station theres a room I caint open, it has two crystals some blades, and something else, How do I raise the door? and another question what do I use the crystles for? thanks

I'm thinking you're talking about a room that has a security gate closed and part open at the bottom. It looks like a cafe or eating counter right?

You can use an EMP grenade on the box that controls the door/ security gate. It causes the door panel to blow and door to open up.

Save crystals for a while and you'll be offered a trade for the crystals eventually. No spoilers here but make sure you talk to bystanders for this trade. If you don't have crystals saved when you talk to the person you can collect and go back for the trade.