16 years for acting like an idiot.
I think it's a reasonable sentence. His mistake caused deaths and a multi million dollar loss, but at least it wasn't on purpose, 'cause that would have made the situation even worse. Nonetheless, he didn't take responsibility where he should have taken it. If he acted like a real captain and didn't leave the ship and actually coördinated a proper evacuation he would have gone off with a lower sentence much easier, because most likely way less people would have died.