The Eliminated

The last thing Eden remembers before waking up in a tiny, box-like room is the adulting ceremony. She remembers not hearing her name, then being corralled out onto a boat. However, elimination did not come with a quick shot to the head.
Instead, Eden is allowed out of the room so that she can explore this strange. . .colony in space. Is being a part of the experiment better or worse than a quick elimination? And where is Xander?