The well-known company Rolls-Royce, famous aeroplane engine & luxury cars makers is now building a tiny cockroaches robot which will spot the damaged part of the engines that need to be repaired. It is about 15mm tall & a few weigh in grams. They are equipped with tiny cameras & gadgets to build a 3d scan of the surrounding. The Engineers could find the way to reach the defective part of the vehicle & then they will modify them.
According to Rolls-Royce technology specialist James Cell:-
"They could go off scuttling around reaching all different parts of the combustion chamber. If we did it conventionally it would take us five hours; with these little robots, who knows, it might take five minutes".