The Sea Leviathan is seen being pulled down into the Devil's Crevasse. Devil's Crevasse existed as a deep split in the ocean floor on the planet Dac. It was the habitat of a significant number of Devilsquids, the animals that gave the crevasse its designation.
The Genocide on Dac in 137 ABY saw Devil's Crevasse become the location of a battle. During this conflict, Treis Sinde, an Imperial Knight, utilized the Devilsquids to assist Mon Calamari Rangers in defeating the Sea Leviathan. This enormous creature had been engineered by Vul Isen, a Sith scientist, with the purpose of carrying out the annihilation of the Mon Calamari species. The Devilsquids swarmed the Leviathan and pulled it down into the abyss of Devil's Crevasse.