GUTS DIG (ガッツディグ Gattsu Digu) is a mecha designed by Nakajima based on the previous GUTS's Peepar. GUTS DIG is armed with an Atomic Thunder (アトミックサンダー Atomikku Sandā) beam on the front drill called Splinder. It was firstly used where Nakajima and the others while trying to dig into the moon surface in order to investigate the Alien Nuaza tomb.

According to the setting, it is said that it can be transformed into a form called "Z Mode" (Zモード Z Mōdo) in which the tip of the fuselage is folded toward the rear, but it is not used in the play.

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