บท 634: Extra One: The Forbidden Depths and the Returnee

Unknown territories, the North Sea.

"Teacher, after decades of hard work, we've finally found a clue, but can this thing really dive into the unknown territories? Last time, Zhao's submersible almost reached its limit..."

"You need to understand that even the twisted bodies could hardly withstand the water pressure at the place where we found the stele, and the true forbidden zones might be hiding many unknown terrifying creatures."

The submersible's design bore a striking resemblance to a whale, with a massive power cabin that could be deemed an underwater bastion, yet the cockpit was very small, so small that the brown-haired young man and the Ten of Spades felt cramped inside it.

"This is something from Mechanical City, designed by that genius personally."

A genius?