The party was captured by the drow and ended up in the slave pen. The party tried to engineer a fight in the slave pen and the guards just shot through the bars of the gate without opening it.

Flink managed to mage hand the key to the gate, on one of his excusions, and secreted it back with him to the cave. They managed to open the cage, and distract the guards, arm themselves, and then made an escape for it. They are heading out the Western passage with the other NPCs in tow.