Rolls-Royce Showcases Swarming Technology At Farnborough Written 28 September 2018

Bloomberg News reports that during the Farnborough Airshow, Rolls-Royce demonstrated an “array of miniature robots designed to speed up engine overhauls by removing the need for powerplants to be detached from the aircraft during shop visits.” The swarming robots, less than half an inch across, are designed to “roam the turbine in gangs beaming pictures back to inspection crews” after being inserted by “snake” hosts. 
More Info (Bloomberg News)