This page contains information regarding Star Trek: Lower Decks, and thus may contain spoilers.
Ancient generation ship
This ancient generation ship was discovered adrift, after several centuries, by the Federation during the late 24th century. The ship's crew was discovered to be mummified in their disabled cryo units.
This ship carried a unique molecular fluid capable of transforming inorganic material into a living ecosystem; the unknown inhabitants of the generation ship had planned to use it to terraform their destination.
In 2380, on Stardate 57538.9, the USS Cerritos assisted the USS Merced in relocating the ship. During the relocation of the vessel, the Merced moved out of formation and accidentally caused a hull breach in the generation ship. This caused a leak of the terraforming emulsion to both the Merced and the Cerritos. Lieutenant Beckett Mariner and Captain Carol Freeman, working together, were able to save the Cerritos, but the Merced was too severely damaged. Its crew were beamed to the generation ship, and survived. (LD: "Moist Vessel")
Deep Space 9 visitors
Alien freighter 1
It visited in 2372, (DS9: "Hard Time", "The Muse") twice in 2373, (DS9: "For the Uniform", "Ties of Blood and Water") multiple times in 2374, (DS9: "Resurrection", "His Way", "Profit and Lace") and several times more in 2375. (DS9: "Treachery, Faith and the Great River", "Inter Arma Enim Silent Leges", "'Til Death Do Us Part")
Prior to its arrival, Odo considered checking when the next transport left DS9 for Betazed, when offering to help Lwaxana Troi find a quiet place to have her baby. Following this suggestion, Troi felt that she "couldn't possibly go there. That's the first place Jeyal will look for me. I know him. He won't give up. Not until he finds me and gets his son back."
Later, when she was released from her obligation to Jeyal, Troi informed Odo that she had "wonderful news", specifically that "there's a transport for Betazed leaving this afternoon. I'm going home." (DS9: "The Muse")
Emi's family's ship
Old derelict freighter
According to Quark, who was auctioning off the contents discovered within, the freighter's cargo hold was "crammed with valuable items of every description. Antiques, paintings, vehicles." (DS9: "In the Cards")
Old waste vessel
This old waste vessel was a large, unoccupied sublight freighter that had been drifting through space while carrying leftover radioactive waste, eventually endangering the population of Gamelan V in 2367.
Upon receiving distress calls from the planet, the USS Enterprise-D towed the barge into the Gamelan sun, narrowly avoiding exposure to the lethal doses of radiation in the process. The barge's propulsion system employed a gaseous core fission reactor but it appeared to have been inactive for the last three hundred years. Geordi La Forge referred to it as a "garbage scow." (TNG: "Final Mission")
Qualor II surplus depot
The Qualor II Surplus Depot Z15 was a Federation junkyard that contained the hulks of numerous retired starships, along with at least two space stations. Among the identified vessels that were located at the depot were the Apollo-class T'Pau, located at Section 18-Gamma-12, and the holding vessel USS Tripoli, located along the outer rim.
Smuggler's combat vessel
Of unknown origin, the vessel was involved in smuggling starship components from the depot by taking the place of the holding vessel USS Tripoli. This combat vessel's armaments were considerable – its phasers were powerful enough to reduce a Galaxy-class starship's shields by at least 15% in a single volley.
Following the discovery of the remains of the Vulcan vessel T'Pau's navigational deflector, the USS Enterprise-D uncovered the operation, and – disguised as an abandoned ship – lay in wait for the vessel's arrival. When it took position to receive that day's shipment of goods, the Enterprise powered up and attempted to make contact. The vessel responded to hails by opening fire. A low-power phaser burst in return destroyed one of its phaser arrays, and caused collateral damage in her cargo bays – which at the time were fully loaded, mostly with weaponry. This led to massive power fluctuations and internal explosions, finally resulting in the destruction of the entire ship. (TNG: "Unification I")
Solarion IV attacker
This vessel attacked the Solarion IV colony in 2368. After its signal was detected by the USS Enterprise-D as it was leaving orbit, the vessel broadcast a message saying the Bajora were responsible for the destruction of the colony. An investigation by the Enterprise-D crew later concluded the attack was staged by the Cardassians. (TNG: "Ensign Ro")
Tyken's Rift being vessel
This alien vessel escaped from the Tyken's Rift in 2367 following a collaboration with the Enterprise-D. Both ships were trapped in the Tyken's Rift. It was a glowing vessel belonging to an alien being. (TNG: "Night Terrors")
Vessels on file in LCARS
In 2364, Lieutenant Commander Data viewed three classes of ships in his search of the files in the USS Enterprise-D library computer. It was not known for whom these classes operated for or represented. The general assumption was that these classes of ships were operational in the mid-24th century.