Yangtze

The Yangtze-31 (Chinese: 扬子; pinyin: Yángzǐ), or possibly Changjiang given that Yangtze is a Westernisation of China's longest river (Chinese: 长江; pinyin: Chángjiāng), is a Chinese nuclear-powered ballistic missile submarine commanded by Zao. When first discovered by the Sole Survivor in 2287, it is lodged in the shallow waters off the coast of The Commonwealth south of Boston Airport and north east of the Four Leaf fishpacking plant. The submarine is not marked on the map until the Sole Survivor swims out to it. Upon discovery, quest Here There Be Monsters is started if it hasn't been received already from Donny Kowalski at The Shamrock Taphouse.

Background
Sometime before the Great War, the Yangtze was sent on patrol into the Atlantic with a payload of six strategic nuclear SLBMs 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.

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.

Layout
Unlike the only other Chinese submarine encountered in the series, SSN-37-1A, the Yangtze is in fact a full scale combat vessel with extensive crew amenities and visible missile and torpedo tubes. It is shaped similarly to the German U-boats of the world wars, instead of the teardrop shape of modern real world subs.

Notable loot

 * Submariner uniform & Submariner hat - Worn by Captain Zao.
 * Fusion core - Inside an open footlocker in the crew quarters.
 * Nuka Cola Quantum (Fallout 4) - Next to the bunk of dead crew member holding a Nuka-Cola truck, in the crew quarters.
 * Chinese officer sword - Laying on a desk in the Captain's quarters. (A room underneath the bridge.)
 * Submariner hat - Worn by The First Mate, now a glowing one (room has higher radiation levels).
 * Warhead (Fallout 4) - Found in the same room as The First Mate, by looting the capsule on a nearby wall.
 * 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)