After emerging from the underground lake, the party walked up one of the side paths to a room dominated by a large pool. Flint's sharp eyes noticed a shimmering in the water, which on closer observation turned out to be a gelatinous cube. Several rounds from his wand of magic missiles took care of that creature, and he dove into the water to see if it led anywhere. The silvery walls of the tunnel led to a new room, and so he went to bring the rest of the party along. Goblin in his heavy armor had some difficulty traversing the waterway, but was able to hold his breath long enough to make it to the other side.
In this room, 6 dwarves and 22 kobolds were mining a wall at the far end of the chamber. Their attention was focused on a strange black mineral deposit, but as the Abolitionists filed into the room, their attention turned to the party. But they were quickly turned to ashes. The zombies, meanwhile, had continued to mine, but were quickly put to rest. Upon examination, the black mineral deposit turned out to be the same material they had seen earlier, where it was in a cylindrical shape with a hatch -- this appeared to possibly be one end of the object. But, not having anything useful to do with it at the moment, the party explored the caves further. They eventually came across the entrance to a warren, with side passages leading to three obviously trapped rooms.
The main passageway led them to a guard chamber, where some elite kobolds awaited them. As always, they were no threat to the party. After wiping them out, the party decided to retreat back to an easily defensible room to recover their resources for what must be the central chamber of this complex.