Theory time: after all life on Earth is wiped out and only the gnashing teeth of Hell remains, the first Triagon is born of Hell's malice, incorporating V1's primordial shape of technological progress, germinating upon the ruined world as the new twisted Tree of Life. It reaches its vascular arms to the Sun and takes its accursed share.

Hell has taken over the whole of the Earth, growing hell masses like tumors throughout the substructure. This is why the Earth is alive in Cruelty Squad.