C468 Danger, Shark.

In the end, Xue Yu still chose to get to the bottom of it and didn't use a substitute underwater.

"System, help me exchange for underwater breathing and swimming proficiency."

Ding!

"Extraction of 1,000,000 Human Qi. Exchange for underwater breathing skill."

Ding!

Extraction of 100,000,000 Human Qi. Exchange for advanced swimming proficiency."

Underwater breathing, as the name suggested