Yangtze

The Yangtze (Chinese: 扬子; pinyin: Yangzi, or possibly Changjiang given that Yangtze is a Westernization of China's longest river (Chinese: 长江; pinyin: Changjiang), is a captured American nuclear-powered ballistic missile submarine lodged in the shallow waters off the coast of The Commonwealth south of Boston Airport, north east of the Four Leaf fishpacking plant. It will not be discovered until the quest Here There Be Monsters has been started.

Background
Sometime before the Great War, the Yangtze was sent on patrol into the Atlantic with a payload of six strategic nuclear ICBMs and an uncertain number of tactical nuclear missiles and torpedoes. It is unknown if the vessel experienced any combat prior to the Great War, but given that by the 2280s it only has three tactical missiles left this is possible. When the Great War began, the Yangtze's captain obeyed his orders to fire the submarine's strategic nuclear weapons at their targets. All but one of the missiles were successfully launched. It's possible, if statistically unlikely given the sheer number of weapons likely launched in the Great War, that one of the missiles was the one that nearly destroyed Boston and created the Glowing Sea.

Shortly after firing its strategic missiles, the Yangtze struck a mine that severely damaged its reactor and forced it to seek shelter in a nearby harbor, which just so happened to be the port of Boston. The damage caused a reactor leak that immobilized the sub and ultimately killed or ghoulified the crew, of which only Captain Zao retained his sanity....

Or so Zao would have you believe... In actuality, the submarine is in fact an American submarine! The terminals are all robco and General Atomics, leading anyone to the conclusion that the submarine was made in America, for the United States Navy. The more plausible truth is that Zao managed to capture the nuclear submarine just before the bombs fell or right after the bombs fell and refused to give up his prize. Zao is a red commie, and must never be trusted.

Layout
Unlike the only other Chinese submarine encountered in the series, SSN-37-1A, the Yangtze is in fact an American vessel captured shortly after the bombs dropped by Zao and his Chinese commandos. The outside may have been repainted, slight alterations may have been made, but the ships core internals are all American. Robco terminals run throughout the vessel and General Atomics built its reactor as evidenced by the fact that GA power plants are needed to be salvaged to repair it. It is shaped similarly to the German U-boats of the world wars, instead of the teardrop shape of real world subs.

Notable loot

 * Fusion core inside an open footlocker in the crew quarters.
 * Submariner uniform and hat worn by the captain, Zao.
 * The First Mate, now a glowing one, only wears the submariner hat.
 * Nuka Cola Quantum next to the bunk of dead crew member holding a Nuka Cola truck in the crew quarters.
 * Chinese Officer Sword laying on a desk underneath the bridge
 * Warhead can be found next to The First Mate, once the capsule next to him is looted.
 * Stealth Boy locked in a supply closet controlled by a terminal (Master)
 * Vault-Tec lunchbox in the galley on the table in the southeast corner.
 * Various Aid Items also locked in a supply closet controlled by a terminal (Advanced).

Related quests

 * Here There Be Monsters

Appearances
The Yangtze only appears in Fallout 4.

Yangtze Янцзы (Fallout 4)