After going to the surface to breathe for a while, Ryan returned to underwater and then headed to the dungeon as fast as possible. He felt that his ears were a bit weird since he was going downward too fast, but it looked like his body was adapting fairly fast to the environment.
Although the dungeon was completely dark, thanks to Dark Vision, Ryan could see his surroundings fairly well. He did the right thing in training that skill previously… However, that skill wasn't a level high enough to grant Ryan the power to see far ahead in the darkness. So, he only found the boss's presence thanks to Radar instead of thanks to his eyes.
"Shit… forget about preemptive strikes, I won't even be able to see the last part of the dungeon completely like this," Ryan thought.