In 1961, AT&T announced it had purchased land in Andover and construction began.
During the winter of 1961-62, during the construction phase, the heat in the dome failed and snow accumulated on top of the dome.
When the heat was restored, a large lake formed on top. Technicians then faced the challenge of removing the water.
They decided to shoot a hole in the Hypolon dome, allowing the water to drain. As the pressure inside equalized, the remaining water and ice was thrown off.
A large piece crashed onto one of the nearby office trailers, crushing it.
The dome with the bulge showing is the construction dome. When construction was completed, a new dome covered the antenna and the bulge, which had been needed to clear the house at the end of the horn, was not needed.
