Yudias Velgear claims to have fought on Velgearsk at a temperature of -800 degrees. However a temperature of that magnitude is not possible on any of the conventional temperatures scales (Celsius, Fahrenheit and Kelvin).
Yudias recalled his time on Velgearsk, noting how being trapped inside a block of ice at the Mutsuba Heavy Machinery Garbage Collection Site #8 was not a big deal by comparison.
- Yu-Gi-Oh! GO RUSH!! episode 0044: "The Chupacabra's Trap"