Voice was betrayed by his partner Hunter Killer and handed over to Makuu so he would be forced to build the Hoshino Space Cannon but he kept the blueprints a secret even after being tortured .
The Hoshino Space Cannon is a weapon that can destroy a planet .
Voice was betrayed by his partner Hunter Killer and handed over to Makuu so he would be forced to build the Hoshino Space Cannon , a weapon that can destroy a planet , but he kept the blueprints a secret even after being tortured .