The Silent Valley Reservoir was built to gather water from the Mourne Mountains and is the main water supply source for most of County Down. The reservoir was built between 1923 and 1933 by a workforce of over one thousand men, nine of whom died. The area is surrounded by the Mourne Wall, built entirely by hand, taking eighteen years to complete.
Does anyone besides me think that it looks like something big is trying to climb out of that hole? Home of the Kraken? :)