As Skunk Works explains, old methods to repair blimps are time-consuming. One has to deflate the blimp (which can take hours), and walk around with a bright, handheld light, looking very carefully for rips and tears.
By contrast, the Spider (short for Self-Propelled Instrument for Damage Evaluation and Repair), however, uses two magnetic halves, one to shine a bright LED light outside the blimp, and one that senses this light from the inside, thus exposing holes and problem areas. It can then move its *****ing mechanism over said hole, repair it, and then snap before and after pics of the fix, allowing a pair of human eyes to inspect it later. Read more...