The view inside Proba-V's Hermod guest technology payload – named for a divine messenger in Norse mythology – to test novel multi-line fibre optic cables with the same kind of high-density connectors employed by terrestrial industry. The experiment comprises 12 fibres inside four independent transmission lines with eight high link connectors. The associated electronics generate randomised signals to pass through the system, and measures the bit rate error over time. The aim is to build up a detailed statistical picture of how the different connectors perform across the satellite’s lifetime, combined with additional orbital and environmental parameters such as temperature measurements. ESA worked with Norwegian company T&G Elektro and Spanish firm DAS Photonics to meet the strict three-month deadline to fly on Proba-V.