When does Spartakus and the Sun Beneath the Sea return?

The series consists of 52 episodes, each between 20 and 25 minutes in length, divided into two 26-episode seasons. The lost city of Arkadia is home to an ancient civilization which escaped a Great Cataclysm in the ancient past by relocating deep within the Earth's crust. Arkadia survives by the light of an artificial sun, the Tehra (Shagma), which is dying. A group of young Arkadian kids and teens defy the law and enter the Archives, and create a messenger, Arkana, and send her above to find help. They travel in a living turtle type spaceship called Tehrig, along with Spartakus and Bic and Bac.