System Knowledge.

Sebastian slept for hours while his mischievous spinal cord did things with his body until he finally woke up. On waking up, he felt that energetic vibrancy of having recovered which spread a sharky smile across his face.

Clearly, feasting on the octopus's meat did his body some real good. All his injuries were healed, he felt like a Megalodon undergoing puberty again.

[You have activated skill: Advanced Electroreceptors.]

With this skill active, he was able to see around where he currently was and confirmed that Verni and the other Great White Sharks were still resting.

He didn't swim out lest he disturbs them, and besides, he was not done with the queries that he wanted answered by his system. 

After the previous battle, the system spammed him with so many new things that he didn't know where to start from. He needed answers fast to curb his curiosity, and he needed them now.