It's not a stupid question, but ice is remarkably durable and has 'self healing properties', to describe ice-cubes sticking together in the most pretentious way possible. There have been projects to make battleships out of ice.

https://en.wikipedia.org/wiki/Project_Habakkuk

Bonus answer: melting it with a flamethrower would be incredibly expensive because of enthalpy.

https://en.wikipedia.org/wiki/Enthalpy