From Halopedia, the Halo wiki
In January 2553, his ship Ariadne experienced complications and had to drop out of slipspace near Venezia. He made contact with the colony asking to land nonessential personnel for safety reasons, but Venezia refused. After their refusal he sent a databurst to Earth, containing a video transmission showing the ship's pennant code ident and asking Earth for help with a technical problem their engineers were having. The UNSC Monte Cassino was sent to evacuate the ship's crew, but slipspace travel's unpredictable nature caused a five-hour delay. The Ariadne's reactor went into meltdown and overloaded shortly after the UNSC Port Stanley arrived in-system, destroying the ship and killing all aboard.
List of appearances