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a massive vat of death liquid
If I remember correctly, one of the chemcial plants that @Cycliste used to work at had a last-resort safety system where if one of the reactions got a bit carried away they'd calm things down by dumping a whole load of methanol on top of it to quench the reaction. To that end, they had a large supply of methanol locked, loaded and good to go at a moment's notice. I can't remember how much they had in stored a vessel ready for a methanol quench, should it be required, but I'm fairly sure that the quantity was measured in tons, plural.
I didn't think 50 / 50 water and methanol was that flammable? Mines in the boot in an Sti water cooler tank originally for the intercooler.