Northern Douluo Continent, where the Northern Fleet Legion was stationed.
With the Northern Fleet Legion at its center, precise Radar equipment swept continuously in every direction, monitoring the slightest movement within several miles.
But at that very moment, beneath the surface of the North Sea, a massive submarine shaped like a whale glided silently into the distance.
On the outside of the submarine, a large character for "Tang" was engraved, making it obvious at a glance that this was a Tang Sect product.
At present, the Federal Government's research into submarines had only just begun. The Federation Fleet did not truly have a submarine formation; only a few experimental submarines were in service.
The Tang Sect, however, possessed a submarine like this. From the looks of it, it even seemed to be a standard-issue submarine, as though it could be mass-produced.
The submarine was one hundred and one meters long, shaped like a whale, ten meters wide, and twenty-four meters at its highest point. It was large enough to accommodate seventy-five people in combat operations.
This submarine possessed the latest technology the Federation did not have, and its cruising speed was one-third faster than a Federation submarine of the same size.
It used the most advanced Soul Array array drive. In the Ocean, it could provide sufficient propulsion by absorbing and converting Water Element.
As long as seven Spirit Masters above Five-Ring activated the Soul Array and cleared out impurities at regular intervals, theoretically, it could continue sailing forever.
It skillfully avoided the Northern Fleet Legion's Radar detection range and headed in the direction of Demon Island. The Northern Fleet Legion's underwater detection devices were weak and could not detect its existence at all.
Aboard this submarine, Wu Changkong was watching the submarine's detection Radar while guiding the submarine's crew.