The Bulgarian commercial diving company Hydromarine JSC. performed underwater works for “Construction of deepsea water discharge of treated waters from the Waste Water Treatment Plant – Sozopol”. 
The pipeline starts from a shaft going out to sea on distance of one nautical mile from the Black sea coast and ends with a diffuser. The pipeline is DN700. From the shaft to the deepsea discharge the length is L = 877,43 m. The deepsea discharge itself has a length L = 1929,37 m.