Since you asked...

What did you use Gmod?

Do you have to break everything you touch, Gordon?

Nope. Good old fashioned physics.

Impressive.

Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.