Mechanist

I made this myself, and I'm aware that there are more that belong in the greatest dads of fandom.

Hey guys, again here with another question.

Today, I rewatched some episodes and one of those was The Northern Air Temple (117) and I had a question about something.

Remember that The Mechanist used to do weapons and other stuff for the Fire Nation and he put them in a room which can only be open by airbending? So, my question is how did he put that stuff in there? By a secret way he did? I don't know. What do you think?