The Megalodon Shark

Megalodon sharks are dangerous. They can crush cars and they will eat anything in there path! Megalodons could still be in our waters without us  knowing.  Megalodons are 18  meters  long, which is 60 feet.

sharksider.com

Where have Megalodons been seen? Megalodons  have  been  seen  in  the Sea of Cortez, South Africa and   a  dead  whale's body was opened up which people think Megalodon attacked it in Hawaii. 

http://www.discovery.com/tv-shows/shark-week/videos/megalodon-monster-shark/

When a son and father were on a fishing  trip, suddenly  the  son said  what  is that  over  there on  the  shore?  It was a whale  that was lying on the shore and its insides were on the sand.  It looked like  there  were  big  big bite  marks.

Sources:
mysteriousuniverse.org
discovery.com
exemplore.com
Sharkopedia, Discovery Communications