In a desperate attempt at survival, mankind took the only route available and descended deep underground, into the dark bowels of the Earth. With nightmares of the catastrophe close behind, the Earth's survivors continued to burrow deeper and deeper, adapting quickly to their new lives in the shelter of the planet and leaving behind a safeguard to prevent anyone from returning to the Surface. As time passed, the migrations continued until the details of the Surface World faded into a long-forgotten myth and no one dared to venture upwards and combat the security system in place. All that was remembered was to keep descending, every century…
Caelum's brother has been missing for almost a decade. He is presumed dead by everyone else except for Caelum who has been training with his rope gun that his brother made for him. One day, there is an earthquake in the arboreteum Caelum works in and he discovers a page from his brother's journal, his first clue...
