Go to the scene where Sidney plays then destroys the music box. Notice that before Sidney goes in Dixon states that there is nothing under the ice but water. Now when Sark assaults Sidney shouldn't he be wet? Also, when Sidney falls in for a short ammount of time she comes out freezing cold. Doesn't that mean tha Sark would have frozen to death? Again when Sidney fell in why couldn't she just swim out through the hole she had fallen through?