The vastness of the building site was at first overwhelming for the young Ethiopian mechanical engineer.
Hundreds were already digging the foundations in tough conditions for what is now Africa's largest hydro-electric dam, straddling the Blue Nile.
Moges Yeshiwas was 27 when he arrived in that remote corner of western Ethiopia in 2012, eager to gain valuable experience in his profession. The completion of the project is set to change his nation, but it also changed his life.
On Tuesday, Prime Minister Abiy Ahmed formally launched the Grand Ethiopian Renaissance Dam (GERD), which will help electrify the country as well as provide power to the region.
The dam wall stretches 1.78km (1.1 miles) across a valley and stands 145m (475 feet) high – it is constructed with 11 million cubic metres of concrete. It has created a huge reservoir, called Lake Nigat, which means dawn in the Amharic language.
The dam's construction on a Nile tributary, which provides most of that great river's water, was controversial with downstream countries. Diplomatic tension with Egypt cranked up and there was even talk of conflict.
But for Ethiopia the GERD has become a symbol of national pride and, in Abiy's view, it has placed his country firmly on the world stage.
On a personal level, Mr. Moges, now 40, was also very proud to be part of it.
Watching the dam's progress day by day was deeply satisfying. I came seeking employment, but somewhere along the way, it stopped feeling like just a job. I grew attached to the project, worrying about its future as if it were my own.
There were challenges. Lengthy separation from family was difficult, he told the BBC. Mr Moges could only go home – a 400km drive away in Bahir Dar – twice a year.
The dam site's remoteness and the at times extreme heat – with temperatures sometimes hitting 45C - also presented issues. Plus, the working hours were long.
Our shifts ran from 7am to 7pm, with only an hour's break for lunch. Then we handed over to the night crew, because the work had to continue around the clock, Mr Moges said.
His job was to make sure the building work was structurally sound and construction standards were maintained.
The GERD project was a rare unifying force as the Horn of Africa country has been rocked by political violence and ethnic strife in the past decade.
While some, like the engineer, worked directly on the dam, millions of other Ethiopians were, literally, invested in it.
People from all walks of life contributed to building the dam through donations and the purchase of government-issued bonds.
Despite claims by US President Donald Trump that Washington financially supported the dam's construction, Addis Ababa maintains it was fully funded domestically.
