A Sheffield production company have taken two local wake boarders beneath the city to film them in action along the storm drains. ‘Low Line’ by Salt Street Productions aims to rediscover what is known as the Megatron. The drains were built by the Victorians and were designed to hold back the flood water, then release it back into rivers. Salt Street Productions specialise in adventure sports videography, and previously produced ‘Red Run’ on the abandoned Sheffield Ski Village.