The infographic below will suggest ways to handle the situation promptly and properly, help you escape in case the boat is turned over when traveling by boat, boat on the river or at sea.
When the ship shows signs of sinking, if you cannot hear, do not understand the instructions of the crew member, go up high and get off the ship.
When you fall into the water and you don't know how to swim, you need to prevent your lungs from flooding by closing your eyes, closing your mouth, holding your breath.
This is the way used by the elite special combat force of the US Navy.