Submarine-launched ballistic missile

The Sub Launched Ballistic Missile (often abbreviated SLBM) is a world object in Fallout 4 located on the Yangtze.

Background
The SLBM is a submarine based ballistic missile ,with a range less than that of a Intercontinental ballistic missile, designed to launch a nuclear payload from a submarine close to the enemy's shoreline.

Yangtze
The Yangtze carried 6 SLBM's ,with high yield warheads, on board during her patrol of the U.S East Coast in October 2077. She was in the vicinity of Boston when the Great War began, launching all but one of her SLBM's, which failed to launch.