Around 700 soldiers of the British Royal Air Force and Royal Engineers, were stationed at Vatnsoyrar during the second world war. They lived in 150 barracks big and small, all along the valley. To the north of Zarepta they erected two large barracks as dance-halls, theaters, cinemas and other forms of entertainment. The officers mess-hall was by the river, with a roundabout and a large fireplace. The petty officers mess was above the road, it also had a fireplace, still visible to this day.
An sea-airplane repair platform was constructed on the western side of the lake, and a little further out they built barracks for blacksmiths and repair-shops. To the north of the lake stood two large searchlights.