This vault is owned by Borvo the Hutt and is used in the Legacy quest called Old Republic Droid Modules: Borvo's Battle Droid. There are also boxes you can loot for Borvo's guns. This also a good place to collect Dejarik Holomonsters. Inside, is an Acklay (CL28 elite) which you can kill to collect carapaces from. Radialing these carapaces will begin the Acklay Armor Quest. Speak to Borvo's Guard outside the vault after you have activated the quest and he'll tell you where to go next. You can get a whole suit of Acklay Armor made this way.