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One day, when I opened my eyes, I had no idea where I was, and saw that I was lying unconscious on a beach.

When I woke up, I found myself stranded on an island.

I heard someone calling my name from far. It was my younger brother shouting my name loudly from the other part of the island.

Then I recalled that we were on a cruise

and during the voyage, when our ship was near the shore, a storm came and struck our ship.

Our ship was wrecked and we all were thrown out of the ship.

Later, we both tried to find the other family members on the island while searching for some food to eat.

We found some coconuts and other fruits. We were able to find all the family members scattered nearby and we all made a plan to survive on the island till some help arrived.

We decided to build a treehouse to safe from wild animals.

to make a boat out of it

 One of us wrote SOS on the sand.

We also tried searching for some wood and planks 

My brother waved a red cloth so that sailors and pilots can see it and come to rescue us.