Episode one sees the workers of United Utilities face the effects of Britain's hottest summer in seven years. Local residents in Salford want to cool down and they've decided that illegally opening fire hydrants is the best way to do it - they pay for the water so why shouldn't they enjoy it?! But the hundreds of thousands of litres of water wasted by hydrant abuse affect the supply to a huge number of homes in the area and the local network inspectors deal with a staggering ten hydrant call outs in just one day. As temperatures rise so do the often smelly and revolting jobs that customer service technicians Adrian and Wes have to handle. It takes a strong stomach to do what these boys do and as long people continue to flush wet wipes and nappies there will always be a drain to unblock. However, it's the out of town reservoirs, where sun seekers put their lives at risk by not paying attention to warning signs, that are one of the biggest worries during the heat wave. We see the devastating impact that death can have on the team charged with patrolling the area.