.// the piva reservoir provides for the country's largest hydro station. it is in urgent need of repair while the country's energy demand continues to rise. so despite great efforts, montenegro is constantly racing against the increasing demands of tourism. >> montenegro on the sparkling adriatic coast. in the 1980s, it was a magnet for the rich and the famous. the country is hoping to build on that legacy. in recent years, a number of luxury hotels have been built along the coast. that's led to a huge demand for water. the country has already invested a lot of money in modern water infrastructure as tourism booms. but all the wastewater needs to be treated. sewage treatment plants are still being built. a pump station is under construction a few meters behind the hotels of herceg novi. it's meant to divert the treated wastewater into the ocean. german engineer joachim zietlow is in charge of the site for the entire wastewater disposal system. the aim is to prevent untreated wastewater from being discharged directly into the ocean. the coastal towns are in