Unidentified alien vessel

A spacefaring vessel, belonging to an unknown species, crash landed on Halo Installation 04 around 40,000 BCE.

History
Around 60,000 years after the firing of the Halo Array, this vessel crash landed on Installation 04 in Sector 1215. 26 hours later monitor 343 Guilty Spark arrived at the crash site and noted the crew had not attempted to exit the vessel. He marked seventeen atmosphere leaks along the hull of the ship that had been caused prior to the crash. An analysis showed these gases to be similar to those that comprised Installation 04's atmosphere. Guilty Spark hoped to get answers from these lifeforms, since he had many questions.

Sometime prior to the crash the ship started broadcasting a distress signal repeated every 72.83 seconds. After attempting to translate it, Guilty Spark blocked the signal, as no communication revealing the location of any of the Halos was allowed. In accordance with procedure, 343 Guilty Spark did not attempt to make physical or remote contact with the possible occupants of the ship. After the distress signal terminated, the monitor had a massive sarcophagus constructed around the remains of the vessel.

Trivia

 * This ship's crash landing may have been previously alluded to in Conversations from the Universe, in which Guilty Spark states that other species had visited the installation prior to the Covenant's arrival. However, it is unlikely that he refers to this incident specifically, as the other races recorded what they encountered on the Halo and then left.
 * The ship bears a noticeable resemblance to the Reapers from the Mass Effect universe, both in design and in coloration, though the ship's boom structures are oriented toward the rear of the craft, while Reapers' tentacles face forward.

List of appearances

 * Halo: Combat Evolved Anniversary
 * Conversations from the Universe