James tells Gault that he wants to move up from the lower decks and when Gault doesn’t seem to want to talk to him about it, he offers to help him find Dwight, who might be the person who set the bomb off.
So, it turns out that Harris created that entire radiation storm – seemingly so he could steal the seahorse necklace. So that he could have his wife - who bears an uncanny resemblence to Dr. Burns- wear it. In bed. Ew?