When Zhang Heng opened his eyes again, he regained his vision, and it was even clearer than before the Red Tide had appeared.
This was his first time using the Filter Lens underwater. Zhang Heng had originally been somewhat worried about whether this red seawater counted as part of the natural environment, but it now seemed that the Filter Lens was still effective against this Red Tide.
Not only had the crimson color vanished, but even the seawater within three hundred meters had become transparent.
Zhang Heng quickly found Nelly, from whom he had been separated earlier.
She was currently swimming deeper into the ruins. Ahead of her, Zhang Heng's old friend—a half-human, half-fish frog monster—held a flashlight and flashed it from time to time, luring Nelly onward.
Zhang Heng did not spot any other monsters nearby for the moment.
Another piece of good news was that after observing the half-human, half-fish frog monster for a while, Zhang Heng discovered that the red seawater affected it as well. Its visibility in the Red Tide was still better than a human's, though—probably around three or four meters in front of it.
That was why it could see Nelly while Nelly had never been able to make out what it looked like.
But Zhang Heng still could not see any sign of Han Lu nearby.
In fact, there was nowhere within his line of sight that she could have hidden.
However, Zhang Heng knew that Han Lu's disappearance was definitely connected to this half-human, half-fish frog monster. As long as he followed it, he might be able to find Han Lu.
Zhang Heng did not hesitate any longer. After putting on his mask, he immediately swam toward Nelly, all while keeping watch on his distance from the monster ahead and staying outside