The oceans and seas are still places of immense mystery to us. Do mermaids exist and do they smell fishy? Is the Kraken real? Are there underwater cities? How much gold is lying down there? The following is a list of some of the best known mysteries. There are no guarantees as to the answers but at least this might get you wondering about all that we don’t know. Of course we could always ask Donald Trump as he seems to know everything… doesn’t he… ahem?