Underground Displacement Technique

Dochuu Engyou no Jutsu (Underground Displacement Technique)
Ninjutsu (Doton) [Earth]
Rank: 3 (C-Class);
Range: Personal;
Target: You;
Duration: 1 post/level;
Saving Throws: None;
Chakra Cost: 4.

This technique allows the user to move through firm, earth-based terrain with a Burrow speed equal to his normal speed, for the duration of this technique. The user cannot run while moving underground. This technique cannot be used to move through hard ground or stone. Furthermore, if the user is within 5 feet of the surface, he may determine if a creature or an object stands above him.

Mastery
With the third step of mastery in this technique, the user may chose to leave no tunnels if he so desires.
With the fifth step of mastery in this technique, the user is able to burrow through hard terrain as well.