repair & Q.A. crew, delivery mechanism, evesdropping/security devices, metrics aquisition, resource management and monitoring sensors/effectors like "pigging"

repair & Q.A. crew, delivery mechanism, evesdropping/security devices, metrics aquisition, resource management and monitoring sensors/effectors like "pigging" bots : https://en.wikipedia.org/wiki/Pigging https://en.wikipedia.org/wiki/Pigging I.D. pipe bots, doing much more than conserving water usage. repair & Q.A. crew, delivery mechanism, evesdropping/security devices, metrics aquisition, resource management and monitoring sensors/effectors