It was developed as a sea-going base of fighter operation, thus being immune to hit and run raids. It could also travel underwater.
The hull was originally designed to carry landspeeders which were often used in ground battles, but it became the custom to upgrade leviathans into being able to carrying starfighters instead, and could carry one squadron, as well as repair and maintenance facilities. The carriers had a top speed of 60 kph. The craft had a crew of 110 and 6 gunners; provisions were also included for 30 additional passengers and up to 7,500 metric tons of cargo.
Hidden beneath the water and always on the move, Leviathans were difficult targets for the enemy. However, because they had no shields and little weaponry, they were extremely vulnerable if detected. Although they usually hid deep underwater, Leviathans had to surface in order to launch their fighters, or at least come close to the surface to scan for targets in orbit. Against spaceborne enemies, the Leviathan often deployed small sensor buoys which floated to the surface of the water. These sensor buoys would scan for enemies in space, storing their data until a time when the Leviathan could safely surface and collect them.