Nullifier-5
this was one of the many World Devastators that were dispatched to the planet Mon Calamari by the Empire, during the First Battle of Calamari. It was badly damaged in the attack, and crashed into the planet's oceans. The Mon Calamari Council deemed the ship too expensive to salvage, and left it to become an artificial reef that began more than 1,500 meters beneath the surface. The Nullifier-5 sank near the planet's equator, in the area known as the Algae Sward. Several years after sinking, the hulk began to leak toxic waste into the water, and the Council was forced to mount an expedition to eliminate the waste and preserver the Algae Sward.