Well, Basically, Nina,Joy and Amber all set off to find a spare key for the mask, and once they find it and open up the case with the mask in, Senkara turns up, demanding that Nina is to put on the mask, Fabian turns up excplaining that he just heard Rufus say that the one who puts on the mask goes into the afterlife to become a God. Senkara persuades Nina to put on the mask, and when she does, she realsies that its a fake and the real one is in the expedidtion. They get the real mask and eddie turns up with the frobiser stone and that makes him the osirian, together, Nina and Eddie defeat both Senkara and Rufus.
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No, she did not because Rufus took the mask from Nina and put it on. Since he was not the chosen one, and was not allowed to wear it and he and Senkara were taken to "hell?" I don't want to give away the rest of the story so watch it.
The tunnels are introduced in season 2 where nina and her friends (sibuna) must get the mask of anubis. Each tunnel has a task and they have to solve each one to get to the mask. In the end, the mask in the tunnels turns out to be fake :D so it's a massive waste of time :D
In the show Nina left becase the chosen one (Nina) and the Osirion (Eddie) had to be kept apart and her gran started getting ill again so she wasnt coming back. Hopefully in season 4. If there is one In real life she had to finish her studies. :)
By solving the clues and defeating Viktor to the mask
The Sibuna gang win the mask, but then Rufus comes along and takes it from Nina, but then he like goes away. Then Victor said that only pure of heart can enter the afterlife. So that's why Rufus couldn't go to the afterlife.