Missile silo (Earth-2042)

A missile silo is an underground vertical cylindrical container built for housing and launching missiles such as the 11-B1 ICBM. These silos are protected by large blast doors on top and are usually connected, either physically or electrically, to a missile launch control center. Kupiga Simu on Onderon hosted several missile silos.

Source

 * https://www.halopedia.org/Missile_silo