. . . . . "Thrella wells were age-old vertical shafts created by the Thrella on Mimban. Many years after the Thrella's extinction, Coway tribes connected a number of their own tunnels to the Thrella wells in order to access the surface of the planet from their subterranean civilization."@en . . "Thrella well"@en . . "Thrella well"@en . . "Thrella wells were age-old vertical shafts created by the Thrella on Mimban. Many years after the Thrella's extinction, Coway tribes connected a number of their own tunnels to the Thrella wells in order to access the surface of the planet from their subterranean civilization."@en .