The construction of dams, dams and reservoirs throughout Indonesia requires services and expertise to work in water. Maintenance of waterways for hydropower / hydroelectric power plants, emergency conditions with obstacles or damage to the dam gate structure, as well as surveylance to mitigate the condition of the dam infrastructure so that it is always in prime condition, is one of PT.TBS’s services. The character of underwater work in the dam structure is deep diving (>40m) and working at a height and working in a confined space/environment. Special work techniques are required to complete the job properly and safely. PT.TBS with the ability of its divers can complete underwater tasks and work on dam infrastructure or dams with high safety standards.