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There have been several incidents in recent years of passengers going overboard from cruise ships.

One video recently captured the moment a man leapt from the front of a liner that was in dock.

So far in 2017 there have been 11 reported cases worldwide.

Last year there were 16 in total and in 2015 there were 27.

While it’s a relatively rare occurrence comparative to the 24.6 million passengers who cruised last year, a man-overboard case signals a very real emergency.

The reasons for passengers going overboard are many and varied, with investigations often failing to uncover the definitive truth.