For safety's sake, Jonathan retrieved a cloak from the museum to conceal himself before bending to enter the narrow passage and, after a few steps, found himself in a more open area.
With his extensive experience navigating sewers, Jonathan knew that in recent decades, the new cities built by the Federation featured spacious sewers, wide enough for two cars to run side by side, with cleaning robots regularly clearing accumulated algae and unflushable debris. Even so, he activated the air filtration system in his mask for good measure.
With the other three under Jonathan's control, the group of four moved through the sewers. The guard led the way, with Jonathan in the middle and the other two following.