A small Starfleet vessel that has carried a seed vault holding samples of every known plant since the 23rd century, tended in turn by the Federation's member worlds and visited by Discovery in 3189.
The USS Tikhov is the seed vault ship of the third-season Star Trek: Discovery episode Die Trying. She has held the Federation's store of plant samples since the mid-23rd century, and each member world takes a turn at providing her caretakers. She survived the Burn.
In 3189 Discovery, newly arrived at Federation Headquarters, is sent to fetch a sample needed to cure sick Kili refugees. The crew find the Tikhov adrift in an ion storm. Her Barzan caretaker, Dr Attis, has been left out of phase by a coronal mass ejection that killed his wife and daughters. The away team bring him back, and Burnham persuades him to accept his loss and release the sample.
Commander Nhan, herself a Barzan, chooses to stay aboard and finish her people's watch.