Egyptian and Sudanese naval forces conducted a multi-day joint military exercise as tensions mount over Ethiopia’s massive dam project being built on the Blue Nile River.

Dubbed “SUD-EGY-T-1” the training, which lasted for several days was conducted at the naval base of Port Sudan on the Red Sea, the Egyptian army announced in a statement.

The Egyptian announcement comes only days after Ethiopia revealed that the construction of the controversial mega-dam, Grand Ethiopian Renaissance Dam (GERD) had reached 90 percent completion.

It also comes as Ethiopia prepares to fill the dam for the fourth time disregard to Egyptian fresh warnings.

Late last month, Egypt issued a new warning against Ethiopia over the multi-billion-dollar dam project which would be Africa’s largest upon completion.

Cairo said “all options are on the table” to deal with any threats to its water supply posed by the Ethiopian mega dam.

“All options are open, and all alternatives remain available, and Egypt has its capabilities, its foreign relations, and its capabilities,” Egyptian Foreign Minister Sameh Shoukry warned.