The Subspace spirals were gigantic subspace vacuoles in the Cardengi Expanse. They were created by the Yochorians as a means of extensively expanding their territory in their domain. They were created by incomprehensibly means. Although Starfleet had theorized immense subspatial and spatial irregularities and energies came into play in forming the intricate vacuole. The 15 discovered in the Cardengi Expanse measured at over 15 centuries in age.