The main aim is to survive until a chopper with the rescue team arrives.

The gameplay: the player shall monitor the health indices; look for the 
items like food, water, medications, burner gas in the possessions other
 fishermen left behind. These items will help him last for another 
several hours.

The player’s dreams will feature the challenges, determining his spirit 
and state of mind. The worse the latter are, the tougher it is for the 
player to survive, while the challenges will become more and more 
complicated