What a wonderful game. I didn't see that coming. I thought the twist would be you find a sunken ship when you reach the very bottom that was the Captain's.
SPOILER ALERT
This game is absolutely clever. Reading one of the emails on the computer mentions going on iTunes and searching with the key word of school. One of the readable books on the shelves is "Schooled on Murder" which talks about the disappearances and death of missing students. That was brilliant.