ONE IMPRESSIVE ROBOT. Indoor drone navigation comes with a variety of unique challenges, not least of which is the issue of having to fit through tight spaces. As noted in the IEEE Spectrum report, this has left developers with two options: make their drones smaller (in which case, they aren't powerful enough to really do much of anything) or put them in protective cages (which also limits their abilities).
While DRAGON can only remain airborne for about three minutes at present, it's both agile and fairly powerful. The JSK developers have big plans for its next stage of development, too. They want to increase the number of modules to 12 and add grippers on each end of the system, giving it the ability to pick up and move objects.