"There is a whole school of them." Yang Shi shouted and everyone turned to look.

"Jade-eyes yellow croakers only appear near sea treasures." Zhen Yuan said and the others immediately regained their composure.

"Ayuan is right. Jade-eyes yellow croakers are like spoiled princesses. They only live near precious spiritual treasures." Shen Xu said and began looking around.

However, he didn’t see the treasure but sensed that their boat was sinking faster.

"Could the treasure be some kind of gravity stone?" Yin Shi speculated.

"A gravity stone wouldn’t affect the water’s density." Feng Xue said.

Although the water that they tested was ordinary, they realised that the water in the ocean was denser. Considering that, they guessed that the density effect only appeared within a certain distance of the catalyst.

Soon after, Xiaoren messaged Shen Xu, telling him that she had already dug the fish pond.

Hearing this, Shen Xu cast a net and began catching the jade-eyes yellow croakers and other sea fish.

"Ayuan, I will make some jade-eyes yellow croaker fish soup for you when we have time." The double said and Zhen Yuan nodded.

"I will wait." The man said.

An incense stick later, the underwater boat suddenly hit something and was hurled back.

Looking out, Zhen Yuan and the others saw a sword-fin great white shark.

At a glance, the shark was fifty metres long, ten metres wide and had more than one thousand serrated teeth. Most importantly, its cultivation was the peak-stage of the tribulation transcending realm.

"How could we meet this evil." Shen Xu complained.

Of the many sea creatures, the sword-fin great white shark was one of the most dangerous.

However, it lived in the deep sea and although the group had been sailing for five months, they were still in the outer sea.

"I will ask a puppet to fire a spirit stones cannon." Shen Xu said and prepared to message a puppet but Yang Shi stopped him.

"I will fight it." He said and the double raised an eyebrow.

"It has a home-ground advantage." He said but Yang Shi shook his head.

"I am a monster cultivator." He said and quickly continued.

"I have mostly had a peaceful cultivation environment since I hatched. This is not conducive for a monster clan cultivator." He explained and Shen Xu nodded in understanding.

"Go." He said.

Soon after, Yang Shi left the underwater boat and transformed into his monster form.

After thousands of years and countless resources, Yang Shi was now a twenty metres long, two-headed python.

Although his body was smaller than the sword-fin great white shark, he did not lose in momentum and blood pressure.

In the blink of an eye, the two monsters started fighting and fierce waves appeared in the underwater ocean.

"This shark is the treasure’s guardian." Shen Xu said, looking around with an expectant expression.

"Why didn’t it claim the treasure for itself?" Yin Shi wondered but no one could answer her.

After all, they still didn’t know what the treasure was.

"The boat is still sinking." Li Wenqiang said and narrowed his eyes.

"That means that the treasure is not on the shark. It’s probably on the sea floor." Shen Xu said and tried to use his spiritual sense to check the surroundings.

Unfortunately, his powerful spiritual sense only penetrated a few metres before his sight went dark.

"My spiritual sense can’t see far." He said and turned to the others.

"Mine too." Each said but Zhen Yuan kept silent and didn’t answer.

Seeing this, Shen Xu knew that Zhen Yuan’s sight was not blocked but he didn’t question him in front of the others.

In this way, the boat sank for two hours before hitting the bottom.

After that, everyone activated a water repelling bead and jumped onto the sea floor.

"Let’s search carefully." Shen Xu said and after collecting the underwater boat, he and the others began searching.

Compared to the top, the water at the ocean bottom was cold and dense, making it difficult for everyone to move around.

"The location of the treasure should be where the water is densest." Feng Xue said and the others agreed.

However, it was a little difficult to choose a direction so the group could only rely on instinct.

Three days passed in the blink of an eye.

On this day, Shen Xu and the others were still searching when the double suddenly gasped and his face turned white.

"What’s wrong?" Zhen Yuan asked, pulling Shen Xu into his arms.

"Yang Shi has killed the sword-fin great white shark but he is injured." The double said and Zhen Yuan frowned.

"I will go get him." Feng Xue said and without waiting for instructions, she changed into a phoenix and forcibly flew upwards.

One day later, she returned with the injured python and stood before Shen Xu and Zhen Yuan.

"He is not badly injured." She said and Shen Xu nodded.

After that, Shen Xu sent Yang Shi to the space to recover while he and the others continued searching.

On the fourth day, Yang Shi exited the space and coincidentally, the group found the place where the ocean water was densest.

"It’s here." Shen Xu said in a confident voice.

"Could it be that oyster shell?" Yin Shi asked, pointing at a multicoloured oyster shell a few metres away.

"That’s the shell of a rainbow oyster." Zhen Yuan said, his eyes narrowed into slits.

At less than one hundred thousand years, the rainbow oyster was just a rare and delicious but it wasn’t precious.

However, after one hundred thousand years, the rainbow oyster transformed into a phantom rainbow oyster that could create and enhance illusions.

"This rainbow oyster is almost two million years old." Shen Xu exclaimed with a shocked expression.

"How is this possible?" Feng Xue muttered.

After all, even though monster cultivators had a longer lifespan than human cultivators, it was still strange that an oyster in the mortal realm had lived for so long.

"Maybe it fell from the immortal realm." Yin Shi speculated.

"That’s possible but the phantom rainbow oyster doesn’t explain the water density." Yang Shi said and everyone exchanged a glance before turning to the oyster.