Dong-Ah Geological Engineering

On June 12, 2009, it was listed on the KOSPI with Daewoo Securities as the lead manager.

In 2024, it succeeded in manufacturing a tunnel boring machine (TBM) using its own technology.^[1]

In South Korea, it has participated in projects such as the Incheon Airport Terminal 2 connecting railway TBM, Seoul Subway Line 9, Geoga Bridge immersed tunnel soft ground improvement project, and Busan New Port and Ulsan New Port ground improvement project.^[2]

In Hong Kong, it was in charge of the New Town reclamation project and the ground improvement and expansion project for the third runway of Hong Kong International Airport.^[3][4]

Currently, it is in charge of the construction of the North–South Commuter Railway in the Philippines.^[5]