Determined to destroy Motherboard in any way possible, Hacker cleverly clogs up her cooling system. Digit brings the kids into Cyberspace to help fix her, but the special coolant Motherboard needs, cryoxide, is found only in Castleblanca. To bring back exactly enough cryoxide for Motherboard, the kids have to figure out the exact volume of Motherboard’s tank. In the process, they discover the importance of a standard unit of measure and fill a most unusual container with the precious cryoxide. Part of the 'Cyberchase" series.