Kethanol

Kethanol is a fictional gas produced by mining in Caves of Despair in Lego Ninjago: Masters of Spinjitzu. It is extremely flammable and explosive.

The Crooked Path
Zane identified a smelly gas as kethanol escaping from the basement of caves. Cole plugged the hole from which the gas escaped, causing the explosion and destruction of caves.

Trivia

 * Name of this gas is based on Ethanol, a carbohydrate gas in alcoholic beverages.