How to get saber Morrowind elders scrolls 3

Many merchants sell them, but if you go to Seyda Neen, by the Silt Strider port there is a smuggles cave called Addamasartus. Once inside the first area has a woman (I believe) standing by a fire, kill her. Open the door to the next area, there is 2-3 enemies and to the left is a slave pen and to the right is a set of descending stairs. Go down the stairs and there will be a pool of water right in front of you. Enter the pool and swim all the way to the bottom. There will be a skeleton and right next to the skeleton will be a Iron Saber.