Vast and mysterious, much of the ocean still remains unexplored to this very day.Will mankind ever truly uncover all the hidden truth that lay dormant on the verybottom in darkness, awaiting to be found? These are the top 5 things you didn't knowabout the ocean.

If you could extract all the salt from the ocean and engulf all land with it, you would have more than enough to cover 5 feet. That's a lot of salt!

Did you know that the Bluefin tuna is the considered one of the fastest fish in the sea and able to swim up to 90 km per hour.They are also highly sought in Asian food markets and sushi bars. They weigh on average around 680 KG.

Depending on their size and weight, they can actually sell for a pretty penny. Some have sold for around $25,000!