Wow. I have no idea what to say. Terrible.
Hope you get things sorted out.
For what it's worth, it's not unheard of (it's just gross) that people use pee to kick start a biological cycle in a tank.
Assuming that anything put into the tank was biological in nature, things may be salvageable, but what's happened is you now have a massive ammonia spike to deal with. The trick here will be to limit this spike. As many, and as large of, water changes that you can do cannot hurt. Run carbon. Some Cycle (bottled bacteria, you can get from usually any LFS) in the water couldn't hurt either. Actually I think there's a similar product specific to saltwater but I forget the brand name offhand. I'll see if I can find it and if I do I'll post it back here.
Good luck.