How do you get in here?

[DALOS]

I know you can get in here cause there's loot in there but how do you do it?

[Nikodemos]

For the first one, go to the elevator in the room you're in, look up and you'll see a vent to access the locked room from inside.

For the second one, look up and follow the infested mass to an explosive barrel. Shoot it and the vent to access it should open.

[Blakrana]

For the first image, that corpus tile has a lift which comes up on the right of that room. Run up the wall, there's a ledge and great. Jump through there and you're in. After that, use the consoles to unlock the doors.

For the second if you look along the windows on that side, you'll see an Explosive barrel. Pop it with a gun that can get it, then go back to the 'broken bridge' and underneath is a grate. Run through that and you should come out in that little alcove, as the barrel destroyed the tendril originally blocking the exit point.

Hope that helps/is clear enough.