A thermobaric bomb is currently the world's most powerful, non-nuclear, explosive device. As scripted however, this particular example is a non-functional ruse.
The "Fake" Bomb - ARROW: Episode 607
In a subsequent episode, the thermobaric bomb reappears—albeit, looking somewhat different. In this scenario, the bomb is now "REAL", and must be dealt with in the most heroic way possible!
The "Real" Bomb - ARROW: Episodes 610 and 612
This project was co-produced by WHITE MONKEY DESIGN and PROPOLOGY. Due to the physical scale of the build (and time constraints) design and construction activities were shared by both companies at the request of the ARROW Prop Department.