Anyone who has been to sea in a small boat would not consider most of these "mysterious". Take Hubert Marcoux as an example. He set out to cross from Nova Scot

Anyone who has been to sea in a small boat would not consider most of these "mysterious". Take Hubert Marcoux as an example. He set out to cross from Nova Scotia to Bermuda in November and was never heard from again. There was very bad weather during his crossing, as expected in November. The mystery, if any, rests in why he would set out to cross one of the nastiest pieces of water in the world in the very worst season. In order for a disappearance at sea to be considered "mysterious" it has to be something that is not easily explained by things like bad weather, alcohol, and hypothermia. If, for example, a crew of naval cadets on a J/Boat were raptured out of Annapolis harbour without a trace on a sunny summer afternoon, that would be a mysterious disappearance at sea. The rest of these--not so much. Edit: corrected passage direction