Righti didn’t realize It was explosive like that but it really is

Flash point 2 °C (36 °F; 275 K) Autoignition temperature 435 °C (815 °F; 708 K) Explosive limits 1.7%-8.2%

Drilling is too risky then. What about dumping liquid nitrogen on the thing until it’s doused?

Quick googling sez that liquid nitrogen might solidify the MMA inside, turning it into even more of a pressure cooker