If it is not nailed down some one will take it. Applies to beer mats or life jackets
Been happening over the last twenty five years sure it happened before that and certain it will carry on happening
Mowgli aims to have 100% survival but in the two incidents that have occurred over the last 35 years (pretty good statistic) luck will have played a large part in survival rate. For those incidents survival rate was approx 50%
Consider the variables that exist in getting the ditching exact. Swell, crest of the wave prevalent wind direction to name a few. Couple that with the stress level which might be increased due to the fact that one has screwed up on the fuel calculation that has now landed(no pun intended) you in this predicament. May be just to many variables with out the intervention of lady luck to assure 100% survival rate.
In my simulator experience have never acted out the scenario of controlled ditching into water let alone a discussion as part of recurrent training