Srilanka, July 15 -- Sri Lanka has marked a major milestone in its irrigation history with the successful completion of excavation work on South Asia's longest irrigation tunnel, officials said.



The 27.7-kilometre tunnel, constructed under the North Central Province Canal Project - a key component of the Mahaweli Master Plan - was completed following a major underground breakthrough involving two advanced Tunnel Boring Machines.



The excavation, which began simultaneously from Maha Meegaswewa and Koduruwawa, concluded when the two tunnel sections met beneath the ground, a major engineering achievement known as a "Tunnel Breakthrough."



The tunnel is being developed under the Mahaweli Water Security Investment Programme with fin...