The Ark-19 is one of many starfaring vessels used by the Autobots in their struggle against the Decepticons' burgeoning interplanetary conquests. It and other Arks are named for the original Ark that disappeared on an expedition within the Benzuli Expanse.
IDW Comics Continuity
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The ship's location was eventually discovered by the Machination and when the Autobots realized this, they decided to move the vessel for security purposes. As soon as the ship breached the surface, however, it was sighted by Ratbat, who called in the coordinates to Megatron. Sixshot was dispatched to intercept the Autobot ship. High above Knoxville, Tennessee, he opened fire on it, destroying its engines and sending it plummeting to Earth.
The Autobots on board the crashing vessel managed to use its bow reverse thrusters to pull it out of its nosedive, seconds before it would have crashed into a human neighborhood. The damaged ship immediately became visible, however, as its stealth countermeasures were knocked out by Sixshot's attack. The Autobots evacuated to a cargo compartment and launched their human passengers with Ratchet to safety in an escape pod. They then dumped the ship's data to Ark-32 and set a self-destruct mechanism to prevent human discovery of Cybertronians and avoid the ship's technology falling into the wrong hands, in accordance with the Code of Interplanetary Conflict.
The burning wreck of Ark-19 crashed into the Gulf of Mexico and exploded seconds later.Fortunately all of the Autobots escaped unharmed.