That is cool. Maybe the aluminum is not heated to high. I worked in a aluminum foundry. The biggest danger was water. If a tablespoon full of water got encapsulated by the molten aluminum. The explosion would be comparable to 10 sticks of dynamite. Back in the 90's it happened at a foundry in Indiana. Destroyed part of the plant and killed one. I was holding my breath watching that video.If you are adventerous you can melt aluminum and pour down into the anthill and have an art sculpture