Harker went on to infiltrate the bodyguard's side to gain information. He was the only one capable to do so, after all, while the others can join in with the scientists. It was also the duty of the bodyguards, as it turned out, to patrol the settlement at night.
That meant that he would have a chance to sneak into Victoria's tent and pry out information from here.
There would be two ways to do so. The simplest one would be to look for anything in her room that might be useful. The second was, of course, to get inside her head through the worms.
The second one was riskier, but had a higher success than the first one. Still, Harker decided that would be for his last resort in case he found nothing in her room. There's a lot more to explore too in Eden besides Victoria's tent, like the dining hall at the center of it all where everyone had their food at a very long table.
