In the vast Shinobi World, where could someone hide without being discovered?
Many Shinobi had experienced this question firsthand.
During the wars of the past, Shinobi often chose different means of concealing their locations to evade their enemies' pursuit.
For Shinobi who possessed chakra, climbing trees was only the basics.
Taking to the skies, going underground, and diving into the sea were all essentially possible.
However, taking to the skies was rather difficult for most Shinobi, while diving into the sea depended far too heavily on the surroundings.
Thus, going underground became the best choice for many ordinary Shinobi.
As long as a Shinobi learned Earth Release ninjutsu and had a minute to spare, he could flee a kilometer or so underground.
Failing that, he could at least descend vertically to somewhere deeper, where the ground offered a degree of interference against sensory abilities.
Even the Uzumaki Clan's sensory abilities weakened as the layers of earth grew deeper.
On this point, Orochimaru and Black Zetsu expressed their wholehearted agreement.
As one of two professional tunnel diggers, Orochimaru could construct a fully equipped underground laboratory within a month and conduct several thoroughly satisfying experiments.
As for Black Zetsu, he had eighty thousand White Zetsu under his command. With a wave of his hand, a massive Underground Castle would be completed.
The White Zetsu all possessed basic Wood Release abilities and could work together to build wooden structures, preventing the Underground Castle from collapsing.
Combined with their innate Mayfly Technique, this allowed them to travel underground without obstruction.
This group of White Zetsu had probably dug more tunnels beneath the Shinobi World than anyone else.
For the sake of Obito, Madara, and Black Zetsu's intelligence network, they could practically be said to be everywhere.
The awakened White Zetsu had always worked diligently