Earth Release: Double Suicide Decapitation Technique (Earth-2356)

While lurking underground, the user grabs a target and drags them into the earth, leaving only their head above the surface. Because victims are rendered unable to move in this state, they are easily subjected to torture or decapitation. Such extreme measures are not required, however; when Obi-Wan Kenobi used this on Sasuke Uchiha, it was only to restrain his Padawan. Sasuke was eventually able to free himself.

Source

 * https://naruto.fandom.com/wiki/Earth_Release:_Double_Suicide_Decapitation_Technique