The loss in 2164 of the USS Franklin under Captain Balthazar Edison, which was carried by a wormhole to the remote planet Altamid.
The disappearance of the Franklin is uncovered in the film Star Trek Beyond. The Franklin, NX-326, was the first Earth ship able to reach warp four. Her captain, Balthazar Edison, was a former MACO who had fought the Xindi and the Romulans and found it hard to accept a peaceful Federation. In 2164 the ship vanished and was recorded as lost in the Gagarin Radiation Belt.
In truth a wormhole had thrown her across space to Altamid, where she crashed. Edison and two of his crew survived by using alien technology that prolonged their lives by draining others, and he became the warlord Krall.
In 2263 the scavenger Jaylah is living in the wreck. Kirk's crew repair the Franklin and fly her to Starbase Yorktown to stop Krall's swarm.