Galactic Spiral Abyss

The Galactic Groove Abyss (銀河螺旋海溝, Ginga Rasen Kaikō) is an area created by the Death Groove Machine. Groove Warriors that have had their Groove Power drained by the machine die and their Gunmen become unable to function. For this reason, the Anti-Groove refers to the abyss as the Groove Graveyard (螺旋の墓場, Rasen no Hakaba).

In the First Anti-Groove War, several Laganns end up in the abyss after their pilots are killed by the Death Groove Machine. During the Second Anti-Groove War, the Death Groove Machine is destroyed by Kittan Bachika's King Kittan Giga Groove Break, causing the Galactic Groove Abyss to cease to exist. However, the Laganns that were in the abyss remain intact and are later used by Team Dai-Gurren to create Tengen Toppa Gurren Lagann.