The group stopped in a room full of waterfalls.The floor was one big pit.
Annabeth offered Briares to come back to the camp but he refused her offer and that's where they asked him about his brothers but at that moment he explained that they are faded even though they were immortals. Percy asked Briares to help them fight the Titans because the war will soon begin and Kronos's army will invade the camp but Briares was too afraid to help and gave negative responses. Briares turned around and trudged and he was lost in the shadows.
The group moved to a better place to camp and went in a corridor made of huge marble blocks
Annabeth felt like this was a good sign because it looked like an older part