So this gets the..
zzz
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I rode "X" and never went upside down.
The short answer to the original question is "it's not possible for anyone to drown on a coaster." The longer answer is "no coaster built over water has had a catastrophic enough failure to crash the train into the water."
As for water rides, that's a different topic, but there are sites where such answers can be found.
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--Greg
"Beat the rush, sign up for your post-Mean Streak MRI now..."
My page My other page And my coaster page
Closed topic.